Josh,
You cannot do this in mysql, as there is no such construct.
Perhaps you've been misled by the title of section 13.2, "Control Flow Functions" <http://dev.mysql.com/doc/mysql/en/Control_flow_functions.html>. Despite the name, mysql has no control flow functions. What it has are functions whose return values are conditional.
There are some cases where
IF (something) THEN (do something)
can be rewritten into valid SQL, but in general the solution is to do this in your application code.
Michael
Josh Howe wrote:
Sorry, I don't think I was very clear. I'm asking a more generic question about control flow expressions. I want to run a sql statement but only if a certain condition is met, namely if a particular record exists in a table. I want to do it all in a single mysql statement, like so:
If ([record exists]) then Do some sql End If
How can I do this? Thanks.
-----Original Message-----
From: Leo [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 19, 2004 11:38 PM
To: Josh Howe
Cc: [EMAIL PROTECTED]
Subject: Re: what is wrong woth this statement?
i didnt fully catch you... is this the kind of query statement you want?
INSERT INTO some_other_table SELECT some_field_list FROM z_mail_systems HAVING COUNT(any_field)>0
On Tue, 19 Oct 2004 12:45:30 -0400, Josh Howe <[EMAIL PROTECTED]> wrote:
if (select count(*) from z_mail_systems > 0) then [insert statement] endif;
How do I do this kind of conditional insert? Thanks.
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