Re: mere millimetres away

At 4:15 PM 8/5/98, Thomas Good wrote:
>Rich,
>---------------------------------------------------------
>I got the following to work fine (so I had to break it!):
>---------------------------------------------------------
>SELECT tr_id, tr_date
>FROM crtrd1 ALIAS1
>WHERE ALIAS1.tr_unit = 'SMA'
> AND (ALIAS1.tr_type = 'A' OR ALIAS1.tr_type = 'I')
> AND ALIAS1.tr_id NOT IN (
> SELECT tr_id
> FROM crtrd1 ALIAS2
> WHERE ALIAS2.tr_unit = 'SMA'
> AND ALIAS2.tr_id = ALIAS1.tr_id
> AND (ALIAS2.tr_type = 'T' OR ALIAS2.tr_type = 'O')
> AND ALIAS2.tr_date > ALIAS1.tr_date
> )
>ORDER BY tr_date DESC;
>
>----------------------------------------------------------------------
>I need to include the patient names so I tried a join to another table
>----------------------------------------------------------------------
> SELECT crtrd1.tr_id, tr_date, client_lname, client_fname
> FROM crtrd1 ALIAS1, svcrd1 ALIAS0
> WHERE ALIAS1.tr_unit = 'SMA'
> AND ALIAS1.tr_id = ALIAS0.tr_id
> AND (ALIAS1.tr_type = 'A' OR ALIAS1.tr_type = 'I')
> AND NOT EXISTS(
> SELECT crtrd1.tr_id
> FROM crtrd1 ALIAS2
> WHERE ALIAS2.tr_unit = 'SMA'
> AND ALIAS2.tr_id = ALIAS1.tr_id
> AND (ALIAS2.tr_type = 'T' OR ALIAS2.tr_type = 'O')
> AND ALIAS2.tr_date > ALIAS1.tr_date
> )
>ORDER BY tr_date DESC;

You should try doing analyze on these things to see why they are taking so
long... I don't see anything wrong with this one, but I'm *NOT* an SQL
expert.

It may be trying to create a table that's just too large...

--
--
-- "TANSTAAFL" Rich lynch(at)lscorp(dot)com