Problems with Triggers

El Jue 15 Abr 2004 08:55, Sebastian Böck escribió:

Hello,

is there a simple operator to determine whether the OLD.value and
NEW.value are different. The <> operator is not working on NULL's.

I need something like this:
NEW.val <> Old.val OR
NEW.val IS NULL AND OLD.val IS NOT NULL OR
NEW.val IS NOT NULL AND OLD.val IS NULL

(NEW.val <> Old.val) OR
(NEW.val IS NULL AND OLD.val IS NOT NULL) OR
(NEW.val IS NOT NULL AND OLD.val IS NULL)

You forgot the parenthesis, to group the conditions accordingly

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Centro de Telematica | DBA, Programador, Administrador
Universidad Nacional
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Martin Marques wrote:

El Jue 15 Abr 2004 08:55, Sebastian Böck escribió:

Hello,

is there a simple operator to determine whether the OLD.value and
NEW.value are different. The <> operator is not working on NULL's.

I need something like this:
NEW.val <> Old.val OR
NEW.val IS NULL AND OLD.val IS NOT NULL OR
NEW.val IS NOT NULL AND OLD.val IS NULL

(NEW.val <> Old.val) OR
(NEW.val IS NULL AND OLD.val IS NOT NULL) OR
(NEW.val IS NOT NULL AND OLD.val IS NULL)

You forgot the parenthesis, to group the conditions accordingly

Yes i did in my mail, but that's not the question.
I wanted to know if there is a special operator that does exactly
this.

Sebastian

On Thu, 15 Apr 2004, [ISO-8859-1] Sebastian B�ck wrote:

is there a simple operator to determine whether the OLD.value and
NEW.value are different. The <> operator is not working on NULL's.

Not as far as I know, although I think you can simplify the last part as
(NEW.val IS NULL <> OLD.val IS NULL)