Re: [GENERAL] slow queries

On Fri, 18 Sep 1998, David Hartwig wrote:

> I would like to see it!   I was not aware that table aliasing could
> have any impact on performance.

Hello Oliver and David,

I was a bit amazed myself.  Federico Passaro, on the SQL list,
helped me out some time ago when a query was failing.
His code worked so well that I filed it away for a rainy day...
this week I decided to try it and see if it helped hasten my
slooooowest query.  It did.

Here is my code (hope it's coherent, I didn't name the tables!):

#!/bin/sh
tput clear
echo -ne "Enter Unit Code: "
read unit
psql millie <<EOF | less
SELECT unit_lname FROM crund1 WHERE unit_id = ${unit};
SELECT S.tr_id, T.i_date, S.client_lname, S.client_fname, S.eth_nic
FROM svcrd1 S, trhist T
WHERE S.client_id = T.pt_id
AND T.unit_id = ${unit}
AND T.o_date IS NULL
ORDER BY S.client_lname;
EOF

Cheers,
Tom

    ---------- Sisters of Charity Medical Center ----------
                   Department of Psychiatry
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    Thomas Good                          <tomg@q8.nrnet.org>
    Coordinator, North Richmond C.M.H.C. Information Systems
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