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DataBase Fundamentals new

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What is the purpose of the DEFAULT keyword in SQL?

To specify the data type of a column

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

To define the maximum value allowed for a column

To create a default index for a table

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What is the purpose of the CHECK constraint in SQL?

To specify the data type of a column

To enforce a condition on the values in a column

To define a primary key for a table

To enforce referential integrity between tables

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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 cannot have a NULL value

The column can have a NULL value

The column must be indexed

The column must contain a unique value

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A subquery in an SQL SELECT statement is enclosed in:

capital letters

braces -- {...}

braces -- [...]

braces -- (...)

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Which of the following is a correlated subquery?

Is a subquery that contains a reference to a table that also appears in the outer query

Correlated subquery always execute independently of the outer query

Uses the result of an inner query to determine the processing of an inner query

Uses the result of an outer query to determine the processing of an outer query

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Which of the following statements is true concerning subqueries?

Cannot use the same table as the outer query

Does not start with the word SELECT

Involves the use of an inner and outer query

Cannot return the same result as a query that is not a subquery

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Match the SQL subquery type with its description

A subquery that returns a single column and a single row

A subquery that is defined within the WHERE clause of the outer query

A subquery that is evaluated once for the entire outer query

A subquery that is evaluated for each row processed by the outer query

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Which keyword is used ...

(match the appropriate)

to eliminate duplicate rows in the result of a subquery?

to include the result of a subquery in the SELECT statement of the outer query?

to define an alias for a subquery?

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