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Unique Predicate
Wed, 03/04/2009 - 20:02 | hdanzl
Specify a test for the absence of duplicate rows.
Syntax
<unique predicate> ::= UNIQUE <table subquery>
Notes
♦ | The predicate evaluates to TRUE if the subquery result is empty or it contains no duplicate rows, else to FALSE. |
Examples
1) | The following example selects students enrolled in none or only 1 course: |
SELECT studentID, studentName
FROM students s
WHERE UNIQUE (
SELECT studentID
FROM enrolls
WHERE studentID = s.studentID
)
Conformance
SQL:2003 standard |
- |
Feature F291 "UNIQUE predicate" |
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