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problem with not exists/ not in

Posted on 2008-09-30
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Last Modified: 2012-05-05
I have posted this question in both the mysql forum and the mssql forum since this is a basic SQL question.

I have two tables: userinfo and moneytrans.

The userinfo contains (amongst others) a userID, a lastvisit date and a current balance.
The moneytrans contains information about moneytransactions - that is (amongst others) a transactiontype (type) and a transactiondate (logdate)
(Yes, i know the database has an unfortunate design, but it's hard to change that right now...)

I want all the users that have not been active for 3 months (userinfo.lastvisit is more than 3 months ago) but has a balance > 0 and has not had a transaction of transactiontype 149 for the past 30 days.

the simplest way for me to write that would be:

    SELECT distinct u.ID, u.money_balance
    FROM trendsalesdk.userinfo u
    WHERE u.LastVisit < DATE_SUB(CURDATE(), INTERVAL 3 Month)
    AND u.Money_Balance > 0.00
    AND (u.Active > 0 OR u.active=-2)
    and (
        u.id not in (
        select userid from moneytrans m2
          WHERE  m2.LogDate <= DATE_SUB(CURDATE(), INTERVAL 30 Day)
          AND m2.Type = 149
          AND m2.Accept = 1
          AND m2.Done = 1
        )
    );

yes, i know I should rewrite that to a left join, but i have simplified my query to this . I think it should work but it doesn't.

when I execute this statement in phpmyadmin, I get almost all users (almost 400.000 users) - even though the first select statement alone returns a considerably smaller amount of users. That makes no sense to me.

1) Why does my query fail?
2) Can someone help me write a query that actually produces the job effectively? I'm getting slightly desperate...
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Question by:RunePerstrup
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2 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 22605187
what about this:
SELECT distinct u.ID, u.money_balance
    FROM trendsalesdk.userinfo u
    WHERE u.LastVisit < DATE_SUB(CURDATE(), INTERVAL 3 Month)
    AND u.Money_Balance > 0.00
    AND (u.Active > 0 OR u.active=-2)
    and (
        u.id not in (
        select userid from moneytrans m2
          WHERE  m2.LogDate > DATE_SUB(CURDATE(), INTERVAL 1 MONTH)
          AND m2.Type = 149
          AND m2.Accept = 1
          AND m2.Done = 1
        )
    )
;

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0
 

Author Comment

by:RunePerstrup
ID: 22605553
I seem to have used a "lesser than" instead of a "greater than". Silly me

As for PHPMyadmin, it still gives the wrong result, but in a command prompt i works fine. Yet another reason Never to use phpmyadmin.

Thanks :-)
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