SQL Quiz No. 1

The statement "You can only have one table in a database file" is incorrect. In a database file, multiple tables can be created and stored. Each table represents a separate entity or set of data, and they can be related to each other through keys or relationships. Having multiple tables allows for better organization and management of data within a database system.

In a relational database, a primary key is a unique identifier for each row in a table. It ensures that each row is uniquely identifiable and helps in maintaining data integrity. A table can have only one primary key, as having multiple primary keys would lead to ambiguity and violate the uniqueness constraint. Therefore, the statement "You can have multiple primary keys on a table" is false.

The statement "There are three types of keys" is incorrect. In reality, there are more than three types of keys. Some examples include physical keys used for locks, cryptographic keys used in encryption, and musical keys used in music theory. Therefore, the correct answer is false.

The statement is incorrect. Using the * character in the select clause does not select all the fields on the entire database. It selects all the columns from the specified table or tables in the query.

The statement is true because the ORDER BY clause in SQL allows the user to sort the result set of a query in ascending or descending order based on one or more columns. This allows for better organization and presentation of the data. Therefore, there are indeed two possible values for the ORDER BY clause: True and False, indicating whether or not the result set should be sorted.

The Select Clause is the most important statement in SQL because it is used to retrieve specific data from a database. It allows the user to specify which columns they want to include in the query result. The Select Clause is essential in constructing meaningful and relevant queries as it determines the information that will be displayed or manipulated. Without the Select Clause, it would not be possible to retrieve specific data from a database, making it the single most important statement in SQL.

In SQL, the single quote (' ') should be used when dealing with text. This is because text values in SQL are typically enclosed in single quotes to indicate that they are string literals. Using double quotes or number signs (#) may cause syntax errors or result in unexpected behavior. Therefore, the correct symbol to use when dealing with text in SQL is the single quote (' ').

A query is a command or request made to a database to search and retrieve data from tables based on a given criteria. It allows users to specify what information they want to retrieve, filter the results, and sort them in a desired order. Queries are used to extract specific data from a database, making it easier to analyze and manipulate the information.

The given statement is false. A primary key is a special field in a database table that uniquely identifies each record in the table. It is not used to establish a relationship between two tables. Instead, a primary key is used to ensure data integrity and enforce uniqueness in a single table. Relationships between tables are established through foreign keys, which refer to the primary key of another table.

The field names in a database typically describe the type of data stored in a particular column or attribute. In this case, "Telephone_number" is a field name because it represents a specific type of data (telephone numbers). AMA Computer Learning Center and Database1.accdb are not field names as they do not describe the type of data stored. The value "6508786" is also not a field name as it represents a specific data entry rather than a description of the data.

A record is a horizontal row of a cell in a database. It represents a complete set of related data that is stored together. In a database table, each record contains specific information about an individual entity or item. Therefore, the correct answer is "Record".

SQL stands for Structured Query Language, not Structural Query Language. It is a programming language used for managing and manipulating relational databases.

The correct answer is "Memo" because the memo data type allows alphanumeric characters and can hold a large amount of text, typically thousands of characters. The text data type is limited to a smaller amount of characters, usually around 255. Numeric data type is used for numerical values, not for holding text. "None of the above" is not the correct answer as "Memo" fits the given description.

Data is not dynamic because it remains the same until it is modified by a process. This statement is incorrect. Data is considered dynamic because it can change or be modified over time, either through manual intervention or through automated processes. Data is not static and can be updated, deleted, or added to as needed. Therefore, the correct answer is False.

In SQL, it is possible to have more than one WHERE clause in a statement. Each WHERE clause can be used to specify different conditions that the data must meet in order to be included in the result set. This allows for more complex and specific filtering of data in SQL queries.