In Predicate

Wed, 03/04/2009 - 20:02 |  hdanzl

Specify a quantified comparison.


Syntax

<in predicate> ::=
<in predicate part 2> ::= [ NOT ] IN <in predicate value>
<in predicate value> ::=


Notes

♦ The degree of the row value predicand, table subquery and row value expressions shall be 1.
♦ The data types shall be comparable.
♦ The predicate evaluates to TRUE if the row value predicand has a matching value in the list of values specified by the in predicate value, else to FALSE.
♦ If the row value predicand is null, then the predicate evaluates to UNKNOWN.
♦ The NOT operator inverts the meaning of the comparison and is equal to:

       NOT ( <row value predicand> IN <in predicate value> )


Examples

1) The following example selects students from California and New York:

       SELECT studentName, state

       FROM students

       WHERE state IN ( 'CA', 'NY' )

2) The following examples uses a subquery with the IN predicate to select students who are enrolled in courseID 730:

       SELECT studentID, studentName

       FROM students

       WHERE studentID IN ( SELECT studentID FROM enrolls WHERE courseID = 730 )


Conformance

SQL:2003 standard

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Core SQL

Feature F561 "Full value expressions"
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