Difference between revisions of "EVL()"
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Latest revision as of 08:05, 4 February 2013
Contents
Purpose
Function to specify an alternative value for an empty expression
Syntax
EVL(<expr1>,<expr2>)
See Also
EMPTY(), ETOS(), IFNULL(), ISNULL(), NVL(), SET NULL, SET NULLDISPLAY
Description
The EVL() function evaluates the expression in <expr1>, and if the expression does not evaluate to an empty value, the evaluated result is returned. If the expression in <expr1> does evaluate to an empty value, the expression in <expr2> is evaluated. If <expr2> does not evaluate to an empty value, the evaluated result is returned. If both <expr1> and <expr2> evaluate to an empty expression, the NVL() function returns 0.
Example
CREATE TABLE contact (firstname c(20), lastname c(20)) INSERT INTO contact (lastname) VALUES ("Smith") SELECT lastname, evl(firstname,"Unknown") from contact
