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  • 1/107 Questions

    22. The SQL command that allows a user to permanently save data changes is _____.

    • INSERT
    • SELECT
    • COMMIT
    • UPDATE
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Database Quizzes & Trivia
About This Quiz

This Database quiz evaluates understanding of SQL commands and their functionalities, focusing on query complexity, command syntax, and transaction control. It is ideal for learners looking to enhance their database management skills.

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  • 2. 

    9. The scheduler establishes the order in which the operations within concurrent transactions are executed.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The scheduler is responsible for determining the order in which the operations within concurrent transactions are executed. This is important in ensuring that the transactions are executed in a consistent and correct manner, avoiding any conflicts or inconsistencies. By establishing a specific order for the operations, the scheduler can ensure that the transactions are executed in a way that maintains the integrity of the data and avoids any potential issues that may arise from concurrent execution.

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  • 3. 

    6. Distributed processing shares a database's logical processing among two or more physically independent sites that are connected through a network.  

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Distributed processing involves dividing the processing tasks of a database among multiple physically independent sites that are connected through a network. This allows for the sharing of the database's logical processing, enabling more efficient and scalable operations. Therefore, the given statement that distributed processing shares a database's logical processing among physically independent sites connected through a network is true.

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  • 4. 

    Although SQL commands can be grouped together on a single line, complex command sequences are best shown on separate lines, with space between the SQL command and the command’s components.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Complex command sequences are best shown on separate lines with space between the SQL command and its components because it improves readability and makes it easier to understand the structure of the command sequence. By separating the commands onto separate lines, it becomes clearer where one command ends and the next one begins. Additionally, adding space between the SQL command and its components helps to visually distinguish the different parts of the command, making it easier to identify and interpret each component. This practice is especially important for complex command sequences that involve multiple SQL commands and components.

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  • 5. 

    8. The most useful feature of PL/SQL blocks is that they let a designer create code that can be named, stored, and executed by the DBMS.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    PL/SQL blocks are a fundamental component of PL/SQL programming language. They allow designers to create reusable code that can be named, stored, and executed by the DBMS (Database Management System). This feature enhances code organization and reusability, making it easier to maintain and manage large codebases. Therefore, the statement is true.

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  • 6. 

    33. SQL requires the use of the _____ command to enter data into a table.

    • INSERT

    • SELECT

    • COMMIT

    • NOT NULL

    Correct Answer
    A. INSERT
    Explanation
    SQL requires the use of the INSERT command to enter data into a table. The INSERT command allows users to add new rows of data into a specific table in the database. This command is essential for populating tables with the desired information and is a fundamental operation in SQL.

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  • 7. 

    2. Although the DBMS is designed to recover a database to a previous consistent state when an interruption prevents the completion of a required set of transactions, the transactions themselves are defined by the end user or programmer and must be semantically correct.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because while a DBMS is designed to recover a database to a previous consistent state in the event of an interruption, the responsibility of defining the transactions and ensuring their semantic correctness lies with the end user or programmer. The DBMS can only ensure the consistency and integrity of the database based on the transactions it is provided with, but it does not have control over the correctness of the transactions themselves.

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  • 8. 

    3. The ANSI SQL standards are also accepted by the ISO.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The explanation for the given answer is that the ANSI SQL standards, which stands for American National Standards Institute Structured Query Language standards, are indeed accepted by the ISO, which stands for International Organization for Standardization. This means that the SQL standards developed by ANSI are recognized and adopted internationally, ensuring interoperability and consistency in the use of SQL across different database management systems.

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  • 9. 

    1. A view is a virtual table based on a SELECT query.

    • True

    • False

    • Option 3

    • Option 4

    Correct Answer
    A. True
    Explanation
    A view is a virtual table that is created based on the result of a SELECT query. It does not store any data itself but instead provides a way to access and manipulate data from one or more tables. By using views, users can simplify complex queries, restrict access to certain columns or rows, and present data in a more meaningful way. Therefore, the statement that "a view is a virtual table based on a SELECT query" is true.

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  • 10. 

    A database language enables the user to perform complex queries designed to transform the raw data into useful information.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A database language allows users to execute complex queries that can manipulate and transform raw data into meaningful information. This enables users to retrieve specific data, perform calculations, combine data from multiple tables, and generate reports or analysis. By using a database language, users can efficiently extract the desired information from a database, making it a valuable tool for data analysis and decision-making.

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  • 11. 

    23. The _____ command defines a default value for a column when no value is given.

    • CHECK

    • UNIQUE

    • NOT NULL

    • DEFAULT

    Correct Answer
    A. DEFAULT
    Explanation
    The DEFAULT command is used to define a default value for a column when no value is given. This means that if a value is not specified for the column during an insert operation, the default value will be used instead.

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  • 12. 

    10. A scheduler facilitates data isolation to ensure that two transactions do not update the same data element at the same time.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A scheduler is responsible for managing the execution of transactions in a database system. One of its key functions is to ensure data isolation, which means that multiple transactions can access and modify data concurrently without interfering with each other. By preventing two transactions from updating the same data element at the same time, the scheduler ensures that the integrity of the data is maintained and conflicts are avoided. Therefore, the statement that a scheduler facilitates data isolation to prevent simultaneous updates is true.

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  • 13. 

    10. In order to manage distributed data, copies or parts of the database processing functions must be distributed to all data storage sites.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In order to manage distributed data effectively, it is necessary to distribute copies or parts of the database processing functions to all data storage sites. This ensures that each site can process and manage its own data efficiently, without relying on a central processing unit. By distributing the processing functions, the workload is distributed across multiple sites, allowing for better performance and scalability in managing distributed data. Therefore, the statement "In order to manage distributed data, copies or parts of the database processing functions must be distributed to all data storage sites" is true.

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  • 14. 

    11. String comparisons are made from left to right.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    String comparisons are made from left to right means that when comparing two strings, the comparison starts from the leftmost character and continues until a difference is found or the end of the strings is reached. This means that the characters in the strings are compared one by one in the order they appear. If a difference is found, the comparison stops and the result is determined based on the ASCII values of the differing characters. Therefore, the given statement "True" is correct.

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  • 15. 

    25. A(n) _____ query specifies which data should be retrieved and how it should be filtered, aggregated, and displayed.

    • INSERT

    • SELECT

    • COMMIT

    • UPDATE

    Correct Answer
    A. SELECT
    Explanation
    A SELECT query is used to specify which data should be retrieved from a database. It also allows for filtering, aggregating, and displaying the data based on specific criteria. This query is commonly used in SQL to retrieve information from tables and present it in a desired format.

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  • 16. 

    36. Which comparison operator indicates a value is not equal?

    • <

    • <=

    • >=

    • <>

    Correct Answer
    A. <>
    Explanation
    The comparison operator "" is used to indicate that a value is not equal to another value. This operator is commonly used in programming languages and databases to compare two values and return true if they are not equal.

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  • 17. 

    13. SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    SQL allows the use of logical restrictions such as OR, AND, and NOT in its inquiries. These logical operators allow users to combine conditions and create complex queries to retrieve specific data from a database. The OR operator allows the retrieval of data that satisfies at least one of the conditions, the AND operator retrieves data that satisfies all the conditions, and the NOT operator retrieves data that does not satisfy a particular condition. Therefore, the statement "SQL allows the use of logical restrictions on its inquiries such as OR, AND, and NOT" is true.

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  • 18. 

    40. The SQL aggregate function that gives the number of rows containing non-null values for a given column is _____.

    • COUNT

    • MIN

    • MAX

    • SUM

    Correct Answer
    A. COUNT
    Explanation
    The SQL aggregate function "COUNT" is used to count the number of rows that contain non-null values for a given column. It returns the total number of rows that meet the specified criteria. This function is commonly used to calculate the number of records in a table or the number of occurrences of a specific value in a column.

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  • 19. 

    7. In Oracle, you can use the SQL*Plus command SHOW ERRORS to help you diagnose errors found in PL/SQL blocks.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The SQL*Plus command SHOW ERRORS in Oracle is used to display the compilation errors that occur in PL/SQL blocks. This command is helpful in identifying and diagnosing errors in the code, allowing developers to quickly locate and fix any issues. Therefore, the given statement is true.

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  • 20. 

    3. To remedy the lack of procedural functionality in SQL, and to provide some standardization within the many vendor offerings, the SQL-99 standard defined the use of persistent stored modules.

    • True

    • False

    • Option 3

    • Option 4

    Correct Answer
    A. True
    Explanation
    The SQL-99 standard introduced the concept of persistent stored modules to address the lack of procedural functionality in SQL and to bring some standardization across different vendor offerings. These modules allow developers to write and store procedural code directly in the database, making it easier to implement complex logic and improve performance. Therefore, the statement "True" is the correct answer.

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  • 21. 

    35. Which command would be used to delete the table row where the P_CODE is 'BRT-345'?

    • DELETE FROM PRODUCT WHERE P_CODE = 'BRT-345';

    • REMOVE FROM PRODUCT WHERE P_CODE = 'BRT-345';

    • ERASE FROM PRODUCT WHERE P_CODE = 'BRT-345';

    • ROLLBACK FROM PRODUCT WHERE P_CODE = 'BRT-345';

    Correct Answer
    A. DELETE FROM PRODUCT WHERE P_CODE = 'BRT-345';
    Explanation
    The correct answer is "DELETE FROM PRODUCT WHERE P_CODE = 'BRT-345';" because the DELETE command is used to delete rows from a table, and the WHERE clause specifies the condition that must be met for the row to be deleted. In this case, the condition is that the P_CODE column must have a value of 'BRT-345'.

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  • 22. 

    19. The COUNT function is designed to tally the number of non-null "values" of an attribute, and is often used in conjunction with the DISTINCT clause.

    • True

    • False

    • Option 3

    • Option 4

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that the COUNT function is indeed designed to count the number of non-null "values" of an attribute. It is commonly used in conjunction with the DISTINCT clause to count the unique non-null values in a column. Therefore, the statement is true.

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  • 23. 

    12. In a page-level lock, the DBMS will lock an entire diskpage.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In a page-level lock, the DBMS will lock an entire disk page. This means that when a lock is acquired on a specific page, the entire page is locked, preventing any other transactions from accessing or modifying any data within that page. This type of lock provides a higher level of concurrency control and ensures that the integrity of the data on the page is maintained.

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  • 24. 

    26. A(n) _____ is an alternate name given to a column or table in any SQL statement.

    • alias

    • data type

    • stored function

    • trigger

    Correct Answer
    A. alias
    Explanation
    In SQL, an alias is an alternate name given to a column or table in any SQL statement. It is used to provide a temporary name to a column or table, which can be helpful in making the SQL statement more readable and concise. Aliases can also be used to rename the output of a query or to provide a shorter name for a table or column with a long name.

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  • 25. 

    2. A sequence is not associated with a table and can be dropped from a database with a DROP SEQUENCE command.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A sequence in a database is a user-defined object that generates a sequence of unique numbers. It is not associated with any specific table and can be used by multiple tables. Therefore, it can be dropped from the database using the DROP SEQUENCE command without affecting any data in the tables. Hence, the given statement is true.

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  • 26. 

    11. A trigger is procedural SQL code that is automatically invoked by the RDBMS upon the occurrence of a given data manipulation event.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A trigger is a type of procedural SQL code that is designed to automatically execute in response to a specific event occurring within a relational database management system (RDBMS). These events are typically data manipulation events, such as inserting, updating, or deleting data in a table. When the specified event occurs, the trigger is automatically invoked by the RDBMS, allowing it to perform a predefined set of actions or operations. Therefore, the statement "A trigger is procedural SQL code that is automatically invoked by the RDBMS upon the occurrence of a given data manipulation event" is true.

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  • 27. 

    40. A _____ lock allows concurrent transactions to access different rows of the same table.

    • database table

    • database table

    • page-level

    • row-level

    Correct Answer
    A. row-level
    Explanation
    A row-level lock allows concurrent transactions to access different rows of the same table. This means that multiple transactions can read or write to different rows of the table simultaneously without blocking each other. This type of lock provides better concurrency and performance compared to page-level or table-level locks, as it allows for more granular control and reduces the chances of conflicts or contention between transactions.

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  • 28. 

    28. The _____ constraint is used to validate data when an attribute value is entered.

    • UNIQUE

    • CASCADE

    • CHECK

    • SET NULL

    Correct Answer
    A. CHECK
    Explanation
    The CHECK constraint is used to validate data when an attribute value is entered. This constraint allows the user to define a condition that must be satisfied for the attribute value to be considered valid. When an attribute value is entered, it is checked against the specified condition, and if it does not meet the condition, the data entry is rejected.

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  • 29. 

    41. A(n) _____ is a query that is embedded (or nested) inside another query.

    • Alias

    • operator

    • Subquery

    • View

    Correct Answer
    A. Subquery
    Explanation
    A subquery is a query that is embedded or nested inside another query. It is used to retrieve data from one or more tables and is typically placed within the WHERE or HAVING clause of the outer query. The result of the subquery is then used by the outer query to perform further operations or filtering. Subqueries are useful for performing complex queries and can help in simplifying the overall query structure.

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  • 30. 

    37. The _____ command is used to restore the database to its previous condition.

    • ROWCOUNT

    • BACKUP

    • COMMIT

    • ROLLBACK

    Correct Answer
    A. ROLLBACK
    Explanation
    The ROLLBACK command is used to restore the database to its previous condition. This command is typically used in situations where a transaction needs to be undone or rolled back due to an error or failure. It allows the database to revert back to the state it was in before the transaction started, ensuring data consistency and integrity.

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  • 31. 

    13. A field-level lock allows concurrent transactions to access the same row, as long as they require the use of different fields within that row.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A field-level lock is a type of lock that allows multiple transactions to access the same row in a database concurrently, as long as they are accessing different fields within that row. This means that multiple transactions can read or write to different fields of the same row at the same time without conflicting with each other. This promotes concurrency and can improve the performance of the system by allowing multiple transactions to work on different fields of the same row simultaneously. Therefore, the given statement that a field-level lock allows concurrent transactions to access the same row as long as they require the use of different fields within that row is true.

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  • 32. 

    21. Transaction is a _____ unit of work that must be either entirely completed or aborted.

    • Time

    • Practical

    • Logical

    • Physical

    Correct Answer
    A. Logical
    Explanation
    A transaction is a logical unit of work because it represents a set of operations that are logically related and should be treated as a single, indivisible unit. This means that either all the operations in the transaction must be successfully completed, or if any operation fails, the entire transaction must be aborted and rolled back to its previous state. Therefore, the correct answer is "logical".

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  • 33. 

    32. A table can be deleted from the database by using the _____ TABLE command.

    • DROP

    • DELETE

    • MODIFY

    • ERASE

    Correct Answer
    A. DROP
    Explanation
    The correct answer is DROP. The DROP TABLE command is used to delete a table from the database. This command removes the entire table structure and all its data from the database. It is a commonly used command when a table is no longer needed or needs to be recreated with different structure or data.

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  • 34. 

    24. The _____ specification creates an individual index on a respective attribute; use it to avoid having duplicated values in a column.

    • UNIQUE

    • NOT NULL

    • UPDATE

    • VARCHAR

    Correct Answer
    A. UNIQUE
    Explanation
    The UNIQUE specification creates an individual index on a respective attribute. This means that each value in the column must be unique and cannot be duplicated. By using the UNIQUE specification, it helps to ensure data integrity and avoids having duplicate values in the column.

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  • 35. 

    36. When a user issues the DELETE FROM tablename command without specifying a WHERE condition, _____.

    • no rows will be deleted

    • the first row will be deleted

    • the last row will be deleted

    • all rows will be deleted

    Correct Answer
    A. all rows will be deleted
    Explanation
    When a user issues the DELETE FROM tablename command without specifying a WHERE condition, all rows in the table will be deleted. This is because the absence of a WHERE condition means that there are no constraints on which rows should be deleted, so the command will delete all rows in the table.

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  • 36. 

    21. When you create a new database, the RDBMS automatically creates the data _____ tables in which to store the metadata and creates a default database administrator.

    • Index

    • Chapter

    • Dictionary

    • Appendix

    Correct Answer
    A. Dictionary
    Explanation
    When you create a new database, the RDBMS automatically creates the data dictionary tables in which to store the metadata and creates a default database administrator. The data dictionary is a collection of database objects that contains information about the structure, definitions, and relationships of the database. It stores information such as table names, column names, data types, constraints, and indexes. The RDBMS automatically creates these tables to manage and maintain the metadata of the database. The default database administrator is also created to have the necessary privileges and permissions to manage the database.

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  • 37. 

    42. In Oracle, _____ retrieves the current value of a sequence.

    • NEXTVAL

    • CURRVAL

    • VARCHAR

    • VARCHAR2

    Correct Answer
    A. CURRVAL
    Explanation
    In Oracle, CURRVAL is used to retrieve the current value of a sequence. It is commonly used after the NEXTVAL function, which generates the next value in the sequence. CURRVAL allows you to obtain the current value without incrementing the sequence.

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  • 38. 

    38. The special operator used to check whether an attribute value is within a range of values is _____.

    • BETWEEN

    • IS NULL

    • LIKE 

    • IN

    Correct Answer
    A. BETWEEN
    Explanation
    The special operator used to check whether an attribute value is within a range of values is "BETWEEN". This operator is used in SQL queries to specify a range of values for a particular attribute. It allows for inclusive range comparisons, where the attribute value must be between two specified values.

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  • 39. 

    34. The _____ command permanently saves all changes—such as rows added, attributes modified, and rows deleted—made to any table in the database.

    • COMMIT

    • SELECT

    • ROLLBACK

    • UPDATE

    Correct Answer
    A. COMMIT
    Explanation
    The COMMIT command is used in databases to permanently save all changes made to a table. It is typically used after executing a series of SQL statements to ensure that the changes are permanently saved and not rolled back. This command is important for maintaining data integrity and consistency in a database.

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  • 40. 

    1. Most real-world database transactions are formed by only one database request.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Most real-world database transactions are not formed by only one database request. In a real-world scenario, a transaction typically involves multiple database requests to perform a series of operations. These operations may include retrieving data, updating records, inserting new data, or deleting existing data. By grouping these requests together as a single transaction, it ensures that all the operations either succeed or fail together, maintaining the integrity and consistency of the database. Therefore, the correct answer is False.

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  • 41. 

    SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement that SQL is considered difficult to learn because its command set has a vocabulary of more than 300 words is false. While SQL does have a wide range of commands and keywords, the difficulty of learning SQL is subjective and can vary from person to person. Some individuals may find SQL easy to learn, while others may struggle with it. The number of words in its command set does not necessarily determine its difficulty level.

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  • 42. 

    12. Triggers can only be used to update table values.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Triggers can be used to perform various actions, including updating table values, but they are not limited to just updating table values. Triggers can also be used to insert, delete, or perform other actions based on certain conditions or events occurring in the database. Therefore, the statement "Triggers can only be used to update table values" is false.

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  • 43. 

     Comparison operators cannot be used to place restrictions on character-based attributes.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because comparison operators can indeed be used to place restrictions on character-based attributes. Comparison operators such as "==" or "!=" can be used to compare character-based attributes and determine if they meet certain conditions or restrictions. Therefore, the correct answer is False.

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  • 44. 

    30. Using the _____ command, SQL indexes can be created on the basis of any selected attribute.

    • CREATE INDEX

    • UPDATE CASCADE

    • SELECT

    • VARCHAR

    Correct Answer
    A. CREATE INDEX
    Explanation
    The CREATE INDEX command in SQL allows for the creation of indexes on selected attributes. Indexes are used to improve the performance of database queries by providing a quick access path to the data. By creating an index on a specific attribute, the database can efficiently locate and retrieve the desired information. This command is essential for optimizing query performance in SQL databases.

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  • 45. 

    The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is incorrect. The COMMIT command is used to permanently save all changes made in a transaction. It is not necessary to use the SAVE command for this purpose.

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  • 46. 

    24. The _____ command restricts the selection of grouped rows based on a condition.

    • DISPLAY

    • HAVING

    • FROM

    • CONVERT

    Correct Answer
    A. HAVING
    Explanation
    The HAVING command is used to restrict the selection of grouped rows based on a condition. It is typically used in conjunction with the GROUP BY clause to filter the results of a query based on aggregate functions such as COUNT, SUM, AVG, etc. The HAVING command allows you to specify conditions that must be met by the groups in order to be included in the result set.

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  • 47. 

    45. A(n) _____ condition occurs when two or more transactions wait for each other to unlock data.

    • Deadlock

    • Exclusive lock

    • Binary lock

    • Two-phase lock

    Correct Answer
    A. Deadlock
    Explanation
    A deadlock condition occurs when two or more transactions are waiting for each other to unlock data. In this state, none of the transactions can proceed, leading to a halt in the system. Deadlocks can happen when transactions acquire locks on resources and then request additional locks that are held by other transactions. Without proper management and prevention mechanisms, deadlocks can significantly impact the performance and functionality of a system.

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  • 48. 

    13. The transaction processor (TP) is the software component found in each computer that requests data.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because the transaction processor (TP) is indeed the software component found in each computer that requests data. The TP is responsible for handling and processing transactions, which involve retrieving and updating data from a database. It acts as an intermediary between the application and the database, ensuring that the requested data is retrieved accurately and securely. Therefore, it is correct to say that the TP is the software component responsible for requesting data.

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  • 49. 

    26. The _____ processor is the software component found in each computer that requests data. It receives and processes the application's data requests.

    • Database

    • transaction

    • Data

    • Network

    Correct Answer
    A. transaction
    Explanation
    The transaction processor is the software component found in each computer that requests data. It receives and processes the application's data requests.

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  • Mar 21, 2023
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  • Dec 11, 2019
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    Hai8179119111

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