Dave Butler wrote:
> I am struggling with a join query using MySQL 3.23.31 under AIX 4.3.3.
> Here are the tables involved:
>
> select CAT.linenum, CAT.acct, FD.amount
> from sched_acct_cat CAT LEFT JOIN fd FD
> ON CAT.acct = FD.acct
> where CAT.sched_acct = 'INC_STMT'
> AND FD.entity='FMCI'
> AND FD.dataview='ACTUAL.Y'
> AND FD.month='OCT01'
> order by CAT.linenum;
>
> Here is the output. Line 5 is missing because of the NULL. Line 4 is
> missing because Account A8200 is 0 for FMCI because it is missing
> from the fd table.
>
> 1,A8010,99999
> 2,A8020, 99999
> 3,A8100, 99999
> 6,AT135, 99999
> 7,A8385, 99999
> 8,A8600, 99999
> 9,A8800, 99999
> 10,A8900, 99999
> 12,AT140, 99999
> .... etc.
>
> I thought the 'LEFT JOIN' clause would keep all the lines and simply
> leave NULLs where it could not provide data. The books I looked at
> seem to imply this.
>
> Thanks for any help on this.
>
> Dave
>
Except, FD.entity will also be NULL, which will cause the AND to fail.
>
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