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The correct answer is that sorting a database in Excel can be done based on three keys, two keys, or a single key. This means that you can choose to sort the data using multiple columns as keys or just one column as the key. The number of keys used for sorting depends on the specific requirements and criteria of the data analysis or organization process.

The correct answer is "realizarea unor game variate de calcule, realizarea de analize economico financiare, calculul amortizarii." This is because financial functions allow for a wide range of calculations, such as determining interest rates, performing financial analysis, and calculating depreciation expenses. These functions are essential for managing and analyzing financial data in various contexts, such as budgeting, investment analysis, and financial reporting.

The correct answer is "stergerea liniei corespunzatoare din foaia de calcul" because deleting a record from a database typically involves removing the corresponding row from a spreadsheet or table. This action physically eliminates the data entry from the dataset. The other options mentioned, such as using a specific command from the data menu or pressing the delete or backspace key, may be applicable in certain software or user interfaces, but they are not the general method for deleting a record from a database.

The correct answer is "construirea modelului in foaia de calcul" (building the model in the spreadsheet). This is the stage where the parameters of the data format are established. The other options, "analiza problemei si proiectarea modelului de rezolvare" (analyzing the problem and designing the solution model) and "utilizarea modelului" (using the model), are not specifically related to setting the format parameters in the spreadsheet.

The correct answer is "=SUM(cantitatea)". This formula calculates the sum of the values in the range "cantitatea".

The answer is explaining that in the calculation of annuities, equal deposits and regular intervals of time are used. The number of periods and the interest rate should refer to the same time interval. The function PMT() calculates the future value for a series of cash flows.

The correct answer is "funstia VLOOKUP efectueaza cautarea pe verticala a unui element in coloana cea mai din stinga a unui domeniu intr-o tabela indexata" and "functia LOOKUP este folosita pentru cautarea valorilor dintr-un vector sau matrice". These statements explain the functions of VLOOKUP and LOOKUP in Excel. VLOOKUP is used to search for a value vertically in the leftmost column of a table, while LOOKUP is used to search for values in a vector or matrix.

The first statement is true because the term "baza de date" (database) was indeed introduced in 1964. The second statement is also true because a data dictionary ensures program independence from data.

The formula for calculation is written at the intersection of the first row and the first column in the results area.

In Excel, protejarea (protection) can be done at the level of the workbook, worksheet, and cells. This means that you can protect the entire workbook, specific worksheets within the workbook, or individual cells within a worksheet. By protecting these levels, you can restrict certain actions such as editing, formatting, or deleting data, ensuring the integrity and security of your Excel file.

The statement "argumentele functiilor pot fi si alte functii" is true. In Excel, it is possible to use functions as arguments within other functions. This allows for more complex calculations and enables users to create dynamic formulas. By using functions as arguments, users can perform calculations based on the results of other functions, making their formulas more flexible and powerful.

The correct answer is Excel, Lotus 1-2-3, and Quattro Pro. These three software tools are commonly used for spreadsheet calculations and data analysis. They provide features for creating tables, performing mathematical calculations, organizing data, and generating charts and graphs. These tools are widely used in various industries for tasks such as financial analysis, data management, and project planning.

The correct answer is "utilizarea modelului". This is because the question asks about the stage in which the analysis of the results is performed, and "utilizarea modelului" refers to the usage or utilization of the model, which would involve analyzing the results obtained from it. The other options mentioned, such as "analiza prob si proiectarea modelului de rez" (analysis of data and projection of the model) and "construirea modelului in foaia de calcul" (building the model in a spreadsheet), do not specifically refer to the analysis of the results.

The relational data model organizes data into tables, with each table consisting of rows and columns. The structural component refers to the way the tables and their relationships are defined, including the primary and foreign keys that establish connections between tables. The manipulative component involves the operations that can be performed on the data, such as inserting, updating, and deleting records. The integrity component ensures that the data in the tables follows certain rules and constraints, such as unique values, referential integrity, and data types. These three components are essential for the relational data model to function effectively.

In foile de calcul Excel, casutele pot fi referite prin adrese absolute, adrese relative și adrese mixte. Adresele absolute sunt fixe și nu se schimbă atunci când este copiată sau mutată o formulă într-o altă celulă. Adresele relative se ajustează automat în funcție de locația relativă a formulei atunci când este copiată sau mutată într-o altă celulă. Adresele mixte combină atât adrese absolute, cât și adrese relative și permit fixarea unei părți a adresei, în timp ce cealaltă parte rămâne relativă.

In a cell, you can write on multiple lines. The "wrap text" option prevents writing on multiple lines in the same cell. The "merge cell" option combines multiple cells. Vertical alignment is not possible in cells.

The correct answer is =AVERAGE(), =COUNT(), =MIN(). These functions are considered statistical functions because they are commonly used in statistical analysis. The AVERAGE() function calculates the average of a range of values, the COUNT() function counts the number of cells that contain numbers in a range, and the MIN() function returns the smallest value in a range. These functions are useful for analyzing data and drawing conclusions in statistics.

The correct answer is defining the criterion zone and the output zone. This means that when extracting information from a database in another area of the spreadsheet, both the criteria zone (which indicates the condition that the records must meet) and the output zone (where the extracted information will be displayed) need to be defined. This ensures that the desired data is correctly filtered and displayed in the desired location.

The correct answer is "prin introducerea unei valori noi in casuta corespunzatoare cimpului modificat, prin folosirea comenzii edit(f2)". This means that modifying a record in a database can be done by entering a new value in the corresponding field box or by using the edit command (f2). This suggests that there are multiple ways to modify a record in a database, but the most common methods are through directly inputting a new value or using the edit command.

The correct answer is "DATE?A1" because it contains a special character "?" which is not allowed in a valid address for mailboxes.

The correct answer is "utilizarea modelului". This is because the question is asking about the stage in which the safety children are achieved, and the correct stage is when the model is being used. The other options mentioned, such as analyzing the problem and designing the model, or constructing the model in a spreadsheet, are not directly related to achieving the safety children.

The given answer lists the characteristics of data organized in a database. These characteristics include partajabilitate (sharability), persistenta (persistence), securitate (security), and validitate (validity). Partajabilitate refers to the ability to share data among multiple users or systems. Persistenta means that the data is stored and maintained over time. Securitate refers to the protection of data from unauthorized access or manipulation. Validitate means that the data is accurate, consistent, and conforms to predefined rules or constraints.

A performant spreadsheet program should allow for simultaneous work with multiple tables, graphical representation of data, and the use of linking and embedding techniques through DDE and OLE. Additionally, it should not restrict the use of predefined functions for financial calculations.

The correct answer is "construirea modelului in foaia de calcul". This is because in Excel, the process of protecting the components of a model is done during the construction phase of the model in the spreadsheet. This involves setting up formulas, formatting cells, and defining data validation rules to ensure the integrity and security of the model. Once the model is built, it can then be used for analysis and decision-making purposes.

The first statement is false because the hierarchical model does not derive from the relational model. The second statement is true as the network model is indeed a development of the hierarchical model. The third statement is also true as the relational-object model is the most recent model and is supported by major software producers dedicated to database management.

In a relationship, there cannot be two identical rows. At most, there can be three identical rows. This is because there is an attribute or group of attributes that differentiate a tuple from all other tuples based on their values.

The given answer states that in Excel, formulas can contain values and operators. These values can include numbers, dates, and text. However, the operators % and ^ cannot be included in the formulas.

The third argument in the Vlookup function indicates from which column the desired value is taken, while the "false" argument, placed at the end, indicates the exact search.

Excel is a program that is used for creating and manipulating spreadsheets, which are a form of tabular calculations. It allows users to perform various mathematical and statistical calculations, organize data, and create charts and graphs. Additionally, Excel also has some database management capabilities, allowing users to store and manage large amounts of data. Therefore, the correct answer is "un program de calcul tabelar, un sistem de gestiune a bazelor de date" (a spreadsheet program, a database management system).

In a database created in a spreadsheet program, a column represents an attribute. An attribute is a characteristic or property of the data being stored in the database. Each column in the table represents a specific attribute, such as a person's name, age, or address. Therefore, the correct answer is "un atribut."

The correct answer is "registrul de lucru este un fisier .xls" because it states that the workbook is a .xls file, which is a common file format for spreadsheets. The other statements are not accurate or relevant to the question.

The correct answer is the order in which data is organized in a database can be analyzed at different levels: physical, internal, global, external, and semantic. The physical level refers to how data is stored on the physical devices, such as hard drives. The internal level refers to the representation of data within the database management system. The global level refers to the overall organization of data across multiple databases. The external level refers to the specific views and access to data for individual users or applications. The semantic level refers to the meaning and interpretation of data within the context of the application or system.

The correct answer is "zona de intrare(datele)". In order to perform the sorting operation, it is necessary to have a designated area where the input data can be stored and accessed. This area is referred to as the "zona de intrare(datele)", which translates to "input zone(data)". This is where the data to be sorted is initially placed before the sorting algorithm is applied.

The correct answer is "permit realizarea de simulari in grafice, permit organizarea datelor in baze de date." This means that spreadsheet programs allow for the creation of simulations in graphs and the organization of data in databases.

The correct answer is a collection of data that is independent, along with the description of the data and the relationships between them. It is also an automated, shared, formalized, and centrally controlled collection of data. This means that a formal database includes data that is organized and structured, with relationships defined between different data elements. It is also automated, meaning that it is processed and managed by computer systems. Additionally, it is shared among multiple users and centrally controlled, ensuring that access and management of the data are regulated.

The correct answer is that sorting keys can be a single field or multiple fields from the database structure. This means that when sorting data in a database, you can choose to sort based on a single field or multiple fields simultaneously.

The given answer states that the disadvantages of organizing data according to the independent file model are the redundancy and inconsistency of data, as well as the isolation of data. This means that in this model, there is a high likelihood of having duplicate or conflicting data, which can lead to inaccuracies and inefficiencies. Additionally, the data is isolated in separate files, making it difficult to access and analyze in a comprehensive manner.

The correct answer explains that in a hierarchical data model, the data structure is represented in the form of a tree. Each child node is dependent on its parent node and cannot exist independently of it. This means that the data is organized in a hierarchical manner, with parent nodes at higher levels and child nodes at lower levels. The relationship between parent and child nodes ensures that the data is structured and organized in a specific hierarchy.

The components of a solving model are arranged in different spreadsheets and in a cascade within the same spreadsheet. This means that different parts of the model are organized in separate spreadsheets, while within a single spreadsheet, the components are arranged in a cascade, meaning that the output of one component is used as input for the next component in a sequential manner.

The given answer correctly states that a table has a name, a column represents an attribute, and a row represents a tuple. This is a basic concept in database modeling, where tables are used to represent entities, and each column in the table represents a specific attribute of that entity. Each row in the table represents a unique instance of that entity, with the values in each column representing the attributes of that instance. Therefore, the given answer accurately describes the key components of modeling reality in tables.

A database is a structured collection of files that contains a collection of data that is interdependent. This means that the files within the database are organized in a structured manner and the data within these files are interconnected and rely on each other.

The correct answer includes "sheet2!C34" and "A:B". "sheet2!C34" refers to a specific cell in the "C" column of the "sheet2" worksheet. "A:B" represents all the cells in columns A and B.

A simulation table is a tool used to model and analyze different scenarios. It is necessary for a simulation table to include a calculation formula, explanatory texts, a group of empty cells to display the results, and a set of values for one or two variables. These components are essential for accurately simulating and interpreting the results of the simulation.

The correct answer is "untilizarea modelului". This means that in the stage of a spreadsheet calculation program, the input data is used or utilized to perform calculations or analysis. The other options mentioned, "analiza problemei si proiectarea modelului de rezolvare" (analysis of the problem and design of the solution model) and "cosntruirea modelului in foaia de calcul" (construction of the model in the spreadsheet), are not the correct stages for inputting data.

In a relational database, the relationships between tables are established through the mechanism of foreign keys. This means that the correct answer is "legaturile dintre tabele se bazeaza pe mecanismul cheii straine." Additionally, the table in which the linking attribute is the primary key is called the parent table, so the answer "tabela in care atributul de legatura este cheie primara se numeste tabele-parinte" is also correct.

The correct answer is IRR, DDB, and FV. These functions are all related to financial calculations. IRR stands for Internal Rate of Return and is used to calculate the profitability of an investment. DDB stands for Double Declining Balance and is a method of calculating depreciation expenses. FV stands for Future Value and is used to calculate the value of an investment at a future date. These functions are commonly used in financial analysis and planning.

The correct answer is meniuri si submeniuri, pitograme din linii de instrumente (standard, formatting). This means that in Excel, commands can be accessed from menus and submenus, as well as from icons in the toolbar (standard, formatting).

The correct answer is the format of the function, a brief description of the function, and distinct ranges for the function's arguments. This means that in the Excel function window, you will see the format of the function, a short description of what the function does, and separate boxes or areas where you can input the arguments for the function. It also suggests that the window may display the result obtained from the previous execution of the function.

The given answer includes the points that highlight the strengths of spreadsheet programs, such as simulations, automatic recalculation of formulas and functions, implementation of financial, statistical, and logical functions, and automation of tasks. It also mentions the ability to display numerical data in two formats, which enhances the security of the computing system. These features contribute to the effectiveness and efficiency of spreadsheet programs in various tasks and calculations.

The correct answer is "secvente de intructiuni ssau comenzi similare elor din limbajele de programare,elemente ce permit descrierea grupurilor de operatiuni repetitive." This is because macros in spreadsheet programs are sequences of instructions or commands similar to those in programming languages, and they also allow for the description of groups of repetitive operations.

The correct answer states that in the calculation of annuities, equal payments are used at regular intervals of time, while in the calculation of amortizations, unequal payments are used. This means that when calculating annuities, the amount paid at each interval is the same, whereas in amortizations, the amount paid at each interval can vary. Additionally, the answer mentions that the Vlookup function allows for vertical searching of a value in the rightmost column of a table.

The correct answer is that the model of data organization ensures the description of data and the relationships between them, as well as the representation of the real world and the events associated with it. This means that the model allows for the organization and understanding of data by describing their attributes and how they are related to each other. Additionally, it allows for the representation of real-world entities and the events that occur in relation to them, providing a comprehensive view of the data and its context.

Intr-o baza de date relationala, cheile pot fi primare, candidat sau alternative. Cheia primara este unica si identifica in mod unic fiecare inregistrare dintr-o tabela. Cheia candidat este o cheie unica care poate fi folosita pentru identificarea inregistrarilor, dar nu este neaparat selectata ca cheie primara. Cheia alternativa este o cheie unica care poate fi folosita ca alternativa la cheia primara sau candidat. Cheile principale si auxiliare nu sunt termeni specifici in cadrul bazei de date relationale si nu sunt considerate raspunsuri corecte pentru aceasta intrebare.

The correct answer is "formule si functii, tabele de simulare." This is because in Excel, formulas and functions are used to perform calculations and manipulate data. They allow users to automate tasks and perform complex calculations. On the other hand, simulation tables are used to simulate different scenarios and analyze the impact of changing variables on the data. Therefore, both formulas and functions, as well as simulation tables, are essential tools in Excel for data analysis and manipulation.

A casuta din foaia de calcul poate fi identificata prin adrese absolute, adrese mixte, adresa relativa sau un nume atribuit in prealabil. Adresele absolute sunt fixe si nu se schimba atunci cand sunt copiate sau mutate. Adresele mixte combina referinte absolute si relative si se schimba in functie de cum sunt copiate sau mutate. Adresele relative se schimba in functie de cum sunt copiate sau mutate. Un nume atribuit in prealabil poate fi utilizat pentru a identifica o casuta si este mai usor de recunoscut decat adresele.

The correct answer is "grafice" and "functii". In Excel, there are wizards available for creating charts and graphs (grafice) to visually represent data, as well as for using functions (functii) to perform calculations and manipulate data. These wizards provide step-by-step guidance and make it easier for users to create charts and use functions effectively in Excel.

The performance of spreadsheet programs is determined by the use of formulas and functions. Formulas allow users to perform calculations and manipulate data within the spreadsheet. Functions, on the other hand, are predefined formulas that can be used to perform specific calculations or tasks. Both formulas and functions are essential in improving the efficiency and accuracy of calculations in spreadsheet programs.

The correct answer is "construirea modelului in foaia de calcul, utilizarea modelului". This answer suggests that loading the product program is necessary during the stage of constructing the model in the spreadsheet and using the model. This implies that the product program needs to be loaded in order to create and utilize the model in the spreadsheet.

The correct answer suggests that the rule "do not use constants in formulas and functions" has the implications of requiring the rewriting of formulas or functions for each data, and eliminating potential simulation capabilities. This means that using constants in formulas and functions would result in the need to modify them every time there is new data, and it would also limit the ability to simulate different scenarios or conditions.

The given answer suggests that the characteristics of organized data in a database include consistency and security. Consistency refers to the accuracy and reliability of the data, ensuring that it is valid and conforms to predefined rules. Security, on the other hand, pertains to measures taken to protect the data from unauthorized access, ensuring its confidentiality, integrity, and availability. These two characteristics are crucial for maintaining the quality and reliability of the data stored in a database.

The correct answer is "foaie de calcul, centralizator electronic, spreadsheet/worksheet." These terms all refer to the specific tool used in computer programs for creating tables and performing calculations. A "foaie de calcul" is the Romanian term for a spreadsheet or worksheet. A "centralizator electronic" is another term used for a spreadsheet or worksheet in some contexts. "Spreadsheet/worksheet" is a general term that encompasses the various names used for this tool in different languages and programs.

The correct answer is "dupa anumite sabloane oferite de sistem" because formatting data in Excel can be done using predefined templates or patterns provided by the system. These templates allow users to quickly apply consistent formatting to their data without having to manually adjust each cell or range. This saves time and ensures that the data is presented in a visually appealing and organized manner.

The correct answer options explain different methods to adjust the dimensions of rows and columns in Excel. The first option suggests using the commands "Format/Row/AutoFit" and "Format/Column/AutoFit Selection" to automatically adjust the height of rows and width of columns based on the content. The second option suggests using the commands "Format/Row/Height" and "Format/Column/Width" to manually specify the height of rows and width of columns. The third option suggests using the mouse in the data area to manually adjust the dimensions. The fourth option suggests using the mouse in the headers of rows or columns to manually adjust the dimensions.

The correct answer is a list of different ways in which data can be organized, namely hierarchically, in a network, relationally, and object-oriented. These are different models or approaches to organizing and structuring data, each with its own advantages and use cases. The hierarchical model organizes data in a tree-like structure, where each record has a parent and multiple children. The network model allows for more complex relationships between records through the use of pointers. The relational model organizes data into tables with rows and columns, and the object-oriented model represents data as objects with properties and methods.

The given answer is correct because both "un nume atribuit unei zone din foaia de calcul" (a name assigned to a range in the spreadsheet) and "o adresa absoluta" (an absolute address) can be used as arguments for the SUM function in a spreadsheet. These arguments can be used to specify the range of cells or individual cells that need to be summed. However, "un sir de caractere" (a string of characters) cannot be used as an argument for the SUM function as it is designed to work with numerical values.

The relational model improves data integrity and confidentiality. This is because it enforces constraints and rules on the data, ensuring that it is accurate and consistent. Additionally, the relational model provides access control mechanisms that allow for the protection of sensitive data, ensuring that only authorized users can access it. By enforcing integrity and confidentiality, the relational model helps to maintain the quality and security of the data.

The correct answer is "amortizarea imobilizarilor dupa mnet liniara" and "vaoarea viitoare a unei investitii curente". These calculations are related to financial functions. "Amortizarea imobilizarilor dupa mnet liniara" refers to the linear depreciation of assets, which is a common method used to allocate the cost of an asset over its useful life. "Vaoarea viitoare a unei investitii curente" refers to the future value of a current investment, which is a calculation used to determine the potential return on an investment over a specific period of time.

The correct answer is a list of possible arguments for Excel functions. These arguments can include cell references, logical expressions, graphical elements, numerical or string variables, and formulas.

The given answer correctly states that the way data is "written" on storage media represents the physical level of data organization. It also correctly states that the way the observed real world is modeled corresponds to the conceptual level of data organization. Additionally, it correctly states that the external level of data organization aims to simplify user-DB interaction and increase security in the database.

The correct answer states that the components of a model can be arranged in different worksheets or in a cascade within the same worksheet. This is true in Excel as it allows users to organize their data and calculations across multiple worksheets or within the same worksheet using grouping and linking functions. Additionally, it is also true that for complex tasks, it is recommended to use macro commands in Excel to automate repetitive tasks and increase efficiency.

The correct answer is "un nume atribuit unei casute din foaia de calcul" and "o adresa absoluta." These are valid arguments for the PV function in Excel. The PV function is used to calculate the present value of an investment, and it requires the input of a cell reference or a specific value for the rate, number of periods, and payment. In this case, using a cell reference (a name assigned to a cell in the spreadsheet) or an absolute address (a specific cell reference) would be appropriate inputs for the PV function.

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The correct answer includes three components that define the relational model: structures of data, operations applied to the data structures, and integrity rules that ensure data consistency. These components are essential in organizing and manipulating data in a relational database system. Structures of data refer to the tables and relationships between them, operations applied to the data structures include querying and modifying the data, and integrity rules ensure that data remains accurate and valid throughout the database.

The correct answer is "este un fisier de descriere globala a bazei de date, asigura independenta programelor fata de date." This is because a data dictionary is a file that provides a global description of the database, including information about the structure, organization, and relationships of the data. It also ensures that programs can access and manipulate the data in a consistent and independent manner, without needing to know the specific details of the data implementation.

The correct answer states that for conducting simulations in a table with a variable, values need to be entered for the variable in the first column/row and there must be an initial starting situation. This implies that in order to perform simulations accurately, it is necessary to input the variable values and establish a starting point for the simulation. Additionally, it suggests that the first column/row is used to represent the variable values for the simulation.

According to the relational model of data organization, the following statements are true: some attributes do not allow NULL values, attributes involved in the calculation of important information do not allow NULL values, and attributes without significant importance can have NULL values.

The correct answer is that in Excel, the arguments of functions can be assigned names to ranges in the worksheet, logical expressions, other functions, and constants.

In applications with independent files, each data is described autonomously in each file in which it appears. Additionally, the description of each data file is mandatory in all programs that read or modify it. This means that each file contains its own description of the data it holds, and this description must be included in all programs that interact with the file.

The correct answer is "linia de tendinta(trendline) se poate defini in grafice 3d, simularile se pot realiza doar folosind grafice 3d, intr-un grafic de tip pie se pot reprezenta doua sau mai multe serii de date." This answer states that trendlines can be defined in 3D graphs, simulations can only be done using 3D graphs, and a pie chart can represent two or more series of data.

According to the given information, each table in the relational model has a unique name, is stored on an external storage device (usually a magnetic disk), and an atomic value is entered at the intersection of a row and a column.

The correct answer is: regula la nivel de atribut, regula la nivel de tabela, regula la nivel de linie, regula la nivel de inregistrare.

These are all restrictions of the data referential model. The rule at the attribute level refers to constraints placed on individual attributes within a table. The rule at the table level refers to constraints placed on the entire table. The rule at the row level refers to constraints placed on individual rows within a table. The rule at the record level refers to constraints placed on the entire record or entry in a table.

The content of a relation in a relational database is represented by the set of tuples that make it up at a given moment. The restriction of domain refers to the set of authorized values for an attribute.

The given answer states that the following statements are true:
1. In formulas and functions, constants are not used.
2. The dimensions of rows and columns are determined based on the data in the headers.
3. Worksheets are renamed with meaningful names.
4. Functions provide solutions for many complex problems from different domains.

Restrictions in a relational database indicate the existence of established and somewhat obligatory constraints. They ensure the increase of accuracy and trustworthiness of the data in the database. These restrictions are declared by the user and must be respected by the database management system (SGBD).

An attribute is defined by its name and domain, and any value of an attribute must fall within a domain defined by values. Attributes that ensure the identification or characterization of an entity can have a NULL value. However, attributes without importance cannot be declared as NOT NULL.

A simulation table is an instrument that tracks the impact of changing the value of a variable on a calculation formula. It is also a way to concretize "What If" questions.

The given answer states that foreign keys are attributes or combinations of attributes that link rows from different relations, referential restriction occurs when a relation refers to another relation, and most DBMSs have mechanisms for declaring and managing referential constraints automatically.

The high cost of applications based on independent files is derived from the high degree of data redundancy, the significant efforts required to interconnect different types of data files, and the efforts to ensure optimal system functioning with minimum integrity and information security.

The correct answer is that the occupied area of a simulation table should contain the formula for calculation, the input values for variables, the area for results, and the output area.

The relational model is advantageous because it proposes data structures that are easy to use. This means that the model provides a straightforward and intuitive way to organize and manipulate data, making it more user-friendly for developers and users. By offering structures that are easy to understand and work with, the relational model simplifies the process of data management and allows for efficient and effective data manipulation.

The given answer is correct. In a relational model, a tuple is a sequence of values of different types. This means that each tuple can contain values of different data types. Additionally, the tuples in a relation must have the same structure, meaning they have the same number of attributes or columns. Lastly, the order of the tuples does not matter in terms of the informational content of the table.

The correct answer states that physical autonomy refers to the ability to modify the internal architecture of the database without changing the conceptual schema and rewriting the programs. Logical autonomy refers to the ability to modify the conceptual schema of the database without rewriting the exploitation programs. Physical autonomy also ensures the portability of the database from one computing system to another without modifying the conceptual schema and programs.

In a table, each tuple represents a record and has a name. Each attribute represents a column in the table and has a domain of values, which defines the range of valid values for that attribute. Additionally, each attribute also has a name to identify it. Each row in the table represents a specific instance and can take values within the domain defined for each attribute. Therefore, the statement "fiecare atribut are un domeniu de valori" (each attribute has a domain of values) and "fiecare atribut are un nume" (each attribute has a name) accurately describe the characteristics of a table.

The given answer is correct. In database terms, the core or nucleus of a database is represented by the data dictionary, which contains metadata about the database structure and organization. The analysis, design, and implementation of the database structure are done using a data model, which provides a conceptual representation of the database. Similarly, the analysis, design, and implementation of the database schema are also done using a data model, which defines the structure and organization of the database at a more detailed level.

The correct answer is "schema reprezinta ansamblul informatiilor stocate la un moment dat in BD". This statement is not true because a schema in a database represents the overall structure, organization, and design of the database, including the relationships between data elements, their semantics, and any constraints or restrictions. It does not refer to the specific data stored at a particular moment in time. Additionally, the statement "schema unei BD evolueaza pe parcursul utilizarii acesteia" is true because the schema of a database can change and evolve as the database is used and new data is added or modified.

In a relational database, it is possible to declare multiple primary keys for a table. This allows for more than one attribute to uniquely identify each row in the table. On the other hand, there can only be one foreign key in a table, which establishes a relationship with another table. It is not necessary for a child table to have a primary key, but it must have a foreign key to establish the relationship with the parent table.

The correct answer is "denumirile tabelelor" (table names) and "restrictiile de unicitate" (uniqueness constraints). In a database schema, table names are included as they represent the different entities or categories of data stored in the database. Uniqueness constraints ensure that each value in a certain column or combination of columns is unique, preventing duplicate entries and maintaining data integrity. The other options, "numele, tipul si lungimea tuplurilor" (names, types, and lengths of tuples) and "restrictiile la nivel de sistem de calcul" (system-level computational constraints), are not explicitly mentioned in the question and therefore not included in the schema of a database.

In the relational model, the primary key uniquely identifies each tuple in a table. The order represents the number of attributes that form the structure of the table. Cardinality represents the number of records loaded in the table.

According to Codd, the primary key must have the following restrictions: uniqueness, minimal composition, non-null values, and entity constraint.

The correct answer states that referential constraint is established between two tables through a common attribute. It also states that it prohibits the occurrence of foreign key values that do not exist in the parent table. Additionally, it mentions that referential constraint occurs when one relationship refers to another relationship.