Null Predicate
Wed, 03/04/2009 - 20:02 | 
hdanzl
Specify a test for a null value.
Syntax
Notes
| ♦ | The degree of the row value predicand shall be 1. |
| ♦ | IS NULL evaluates to TRUE if the row value is null, else to FALSE. |
| ♦ | IS NOT NULL evaluates to TRUE if the row value is different from null, else to FALSE. |
Examples
| 1) | The following example selects students who don't take any courses: |
SELECT studentID, studentName
FROM students s
left join enrolls e ON e.studentID = s.studentID
WHERE e.studentID IS NULL
Conformance
|
SQL:2003 standard |
- - |
Core SQL Feature F481 "Expanded NULL predicate" |
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