Re: Query Possible

[Michael Stassen]

First, I think the LEFT JOIN is unnecessary.  Rows in members without a 
corresponding row in active will not have acct_days>0 (it'll be NULL), so, 
by using LEFT JOIN you are (possibly) creating rows only to discard them.  I 
think a simple join will do.

You want a multi-table update:
  UPDATE members JOIN active
  ON active.memid = members.memid
  SET mmembers.account = 2
  WHERE active.acct_days > 0 AND members.account = 1;
This works starting with 4.0.4, so it will work in your 4.0.20.  See the 
manual <http://dev.mysql.com/doc/mysql/en/UPDATE.html> for more.

Michael
Mike Blezien wrote:
Hello,
MySQL version 4.0.20
I'm trying to figure out, if it's possible to do, with one query to 
update a single table.

Query #1
select m.memid from members m left join active a
on a.memid = m.memid where a.acct_days > 0 and m.account = 1;
Query # 2
update members set account = 2 where memid in (results from query #1)
Can this all be done in one sql statement, in query 2?
TIA
Mickalo



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