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Thread: trying to do an update a bit confused.

trying to do an update a bit confused.

From

"Joel Fradkin"

Date:

19 April 2005, 14:06:03

update tblcase set merchandisetotal =

(

COALESCE(( SELECT sum(m.quantity::numeric * m.amount) AS merchandiseamount

FROM tblmerchandise m

WHERE m.caseid = tblcase.caseid AND m.clientnum::text = tblcase.clientnum::text), 0.0)

)

I tried running the above and it wants to do a sum on all the records in tblcase instead of just the one being updated, what am I doing wrong?

Joel Fradkin

Re: trying to do an update a bit confused.

From

KÖPFERL Robert

Date:

19 April 2005, 14:43:46

You're most probably missing a Where clause after the parentensis. see:

-----Original Message-----
From: Joel Fradkin [mailto:jfradkin@wazagua.com]
Sent: Dienstag, 19. April 2005 16:06
To: pgsql-sql@postgresql.org
Subject: [SQL] trying to do an update a bit confused.

update tblcase set merchandisetotal =
(
COALESCE(( SELECT sum(m.quantity::numeric * m.amount) AS merchandiseamount
FROM tblmerchandise m
WHERE m.caseid = tblcase.caseid AND m.clientnum::text = tblcase.clientnum::text), 0.0)
)
WHERE <condtion that selects one record>;

I tried running the above and it wants to do a sum on all the records in tblcase instead of just the one being updated, what am I doing wrong?

Joel Fradkin

Re: trying to do an update a bit confused.

From

"Joel Fradkin"

Date:

19 April 2005, 16:58:30

I am not updating 1 record.

I have : WHERE m.caseid = tblcase.caseid AND m.clientnum::text = tblcase.clientnum::text)

Which should do the aggregate on the record that is being updated (least as I understood it).

It should update all record in case with either 0 if there are no merchandise records or do a sum of the merch records for the case being updated.

Joel

I also never heard back on the merge join issue (why do I need to specify them off on one machine and it runs faster on the other).

I am guessing it is memory related and config related, but I am about to give up on postgres as I am just not getting all my views to run fast enough.

You guys could say my views are bad SQL design etc, but they run fine in MSSQL. I don’t mind visiting each one to make them better, but I am just not able to increase the speed on all of them. The last one about assoc finally did run in 3 secs with merge joins off which is pretty fast, but now I have others that seem pretty simple to me and yet run very slow.

You're most probably missing a Where clause after the parentensis. see:

-----Original Message-----
From: Joel Fradkin [mailto:jfradkin@wazagua.com]
Sent: Dienstag, 19. April 2005 16:06
To: pgsql-sql@postgresql.org
Subject: [SQL] trying to do an update a bit confused.
update tblcase set merchandisetotal =
(
COALESCE(( SELECT sum(m.quantity::numeric * m.amount) AS merchandiseamount
FROM tblmerchandise m
WHERE m.caseid = tblcase.caseid AND m.clientnum::text = tblcase.clientnum::text), 0.0)
)
WHERE <condtion that selects one record>;

I tried running the above and it wants to do a sum on all the records in tblcase instead of just the one being updated, what am I doing wrong?

Joel Fradkin

Re: trying to do an update a bit confused.

From

Jaime Casanova

Date:

19 April 2005, 23:03:41

On 4/19/05, Joel Fradkin <jfradkin@wazagua.com> wrote:
>
>
>
> update tblcase  set merchandisetotal =
>
> (
>
> COALESCE(( SELECT sum(m.quantity::numeric * m.amount) AS merchandiseamount
>
>            FROM tblmerchandise m
>
>           WHERE m.caseid = tblcase.caseid AND m.clientnum::text =
> tblcase.clientnum::text), 0.0)
>
> )
>
>

Put the coalesce inside the select:
update tblcase  set merchandisetotal =     (SELECT COALESCE(sum(m.quantity::numeric * m.amount),0.0) AS
merchandiseamount       FROM tblmerchandise m      WHERE m.caseid = tblcase.caseid AND m.clientnum::text =
tblcase.clientnum::text)

--
Regards,

DBA* Jaime Casanova
(DBA: DataBase Aniquilator ;)