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DataBase Fundamentals new

DataBase Fundamentals new

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Which data type would you use to store whole numbers in SQL?

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What is the purpose of the UNIQUE constraint in SQL?

To define a primary key for a table

To enforce a unique value for a column

To specify the data type of a column

To set a default value for a column when NULL is provided

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What is the purpose of an index in a database?

To store computed values based on other columns.

To store large binary objects such as images or documents.

To improve the performance of data retrieval operations.

To optimize the database querying speed

To enforce referential integrity between tables.

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What is the purpose of the DROP TABLE statement in SQL?

To delete a table from a database

To delete a database

To delete a column from a table

To delete a record from a table

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What is the purpose of the DEFAULT keyword in SQL?

To specify the data type of a column

To create a default index for a table

To set a default value for a column when no value is specified

To define the maximum value allowed for a column

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What is the purpose of the CHECK constraint in SQL?

To define a primary key for a table

To enforce referential integrity between tables

To specify the data type of a column

To enforce a condition on the values in a column

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What is the purpose of a data dictionary in database design?

To generate reports and perform data analysis.

To store user credentials and access permissions.

To define the structure, attributes, and relationships of the database objects.

To store backup copies of the database.

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Write the full definition of the DDL in SQL

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What does the NOT NULL constraint indicate in SQL?

The column must contain a unique value

The column must be indexed

The column can have a NULL value

The column cannot have a NULL value

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A subquery in an SQL SELECT statement is enclosed in:

capital letters

braces -- {...}

braces -- [...]

braces -- (...)

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