Re: Why can't I use an "AS" value in the WHERE clause.

[Michael Stassen]

Adam,

That won't work.  Daevid doesn't have a column named active.  Nor does he 
have to do the math twice.  As was pointed out earlier, he can do what he 
wants using HAVING instead of WHERE, like this:

  SELECT *,
  IF(((unix_timestamp()-unix_timestamp(last_seen)) < 600),1,0) active
  FROM wifi_table
  HAVING active = 1;
Michael

Adam wrote:

Daevid,

SELECT *
    FROM wifi_table
 WHERE active = 1
 HAVING unix_timestamp()-unix_timestamp(last_seen) < 600;
Regards,
Adam
On Apr 5, 2004, at 8:29 PM, Daevid Vincent wrote:

I'm curious when will I be able to do something like this:

SELECT *, IF(( (unix_timestamp()-unix_timestamp(last_seen)) < 
600),1,0) as
active FROM wifi_table WHERE active = 1;

It's so obnoxious, especially since I can do this:

SELECT *, IF(( (unix_timestamp()-unix_timestamp(last_seen)) < 
600),1,0) as
active FROM wifi_table WHERE unix_timestamp()-unix_timestamp(last_seen) <
600;

Why do I have to do the math TWICE?!

*sigh*


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