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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
The SQL -92 wildcards are ____ and ____ .

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

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Introduction to SQL
Which SQL keyword is used to retrieve only unique values?

DIFFERENT
UNIQUE
DISTINCTIVE
DISTINCT

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Introduction to SQL
............. joins two or more tables based on a specified column value not equaling a specified column value in another table.

OUTER JOIN
NON-EQUIJOIN
EQUIJOIN
NATURAL JOIN

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Introduction to SQL
To remove duplicate rows from the results of an SQL SELECT statement, the ________ qualifier specified must be included.

DISTINCT
ONLY
SINGLE
UNIQUE

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Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

True
False

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