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@lscorp.com