Difference between revisions of "NULL Predicate"
From Recital Documentation Wiki
Yvonnemilne (Talk | contribs) m (NULL PREDICATE moved to NULL Predicate) |
Helengeorge (Talk | contribs) |
||
| Line 1: | Line 1: | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
==Purpose== | ==Purpose== | ||
Special predicate | Special predicate | ||
Revision as of 15:16, 29 October 2009
Purpose
Special predicate
Syntax
<expression> IS [NOT] NULL
See Also
PREDICATES, INSERT, SELECT, UPDATE
Description
NULL is a special predicate to evaluate whether the specified <expression> is NULL. The optional NOT can be used to evaluate whether the specified <expression> is not NULL.
Example
EXEC SQL SELECT name, address, balance, cost*1.15 FROM accounts WHERE paid_date < date() AND ord_value IS NULL ORDER BY name, paid_date;
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
