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Introduction to SQL

Introduction to SQL
A SELECT statement within another SELECT statement and enclosed in square brackets ([...]) is called a subquery.

True
False

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Introduction to SQL
Count function in SQL returns the number of

groups.
values.
columns.
distinct values.

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Introduction to SQL
The SQL -92 wildcards are ____ and ____ .

question mark (?); asterisk (*)
underscore(_); question mark (?)
percent sign (%); underscore (_)
asterisk (*); percent sign (%)

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Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

True
False

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Introduction to SQL
A subquery in an SQL SELECT statement is enclosed in:

braces -- {...}.
parenthesis -- (...) .
brackets -- [...].
CAPITAL LETTERS.

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Introduction to SQL
There is an equivalent join expression that can be substituted for all subquery expressions.

False
True

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