On May 9, 2005, at 18:00, Zlatko Matic wrote:
> This is a newbie question: what is the difference between using = and
> := in plpgsql function ?
In pl/pgsql,
:= is assignment
= is a logical comparison for equality
Some languages, such as perl, use = for assignment and == for logical
comparison.
x = 1
is a boolean result
x := 1
gives x the value of 1
Quick example:
x := 2; -- gives x the value of 2
IF (x = 1) THEN -- x = 1 is false
x := 3; -- skipped
END IF;
RETURN X; -- returns 2
Again:
x := 1; -- gives x the value of 1
IF (x = 1) THEN -- x = 1 is true
x := 3; -- perform assignment
END IF;
RETURN x; -- returns 3
Hope this helps.
Michael Glaesemann
grzm myrealbox com
