Thanks for all your answers. Very helpful.
What if after adding all those hours in one long transaction,
I want to send a query to check the MONTHLY TOTAL HOURS
(including those just entered)
and if they exceed N number of hours, all those records added
should *ROLLBACK*?
BEGIN;
insert..........
insert.........
if sum(hours)>N then ROLLBACK
END;
Is that possible? Maybe with just plain SQL? (and one transaction)
On 8/31/05, Philip Hallstrom <postgresql@philip.pjkh.com> wrote: > On Wed, 2005-08-31 at 12:49 -0400, Henry Ortega wrote:
>> Ok. Here's TABLE A
>>
>> emp date hours type
>> JSMITH 08-15-2005 5 WORK
>> JSMITH 08-15-2005 3 WORK
>> JSMITH 08-25-2005 6 WORK
>>
>> I want to insert the ff:
>> 1.) JSMITH 08-15-2005 8 VAC
>> 2.) DOE 08-16-2005 8 VAC
>>
>> #1 should fail because there is already 8 hours entered as being
>> Worked on 08-15-2005 (same date).
>
> sorry, did not notice the duplicates before my previous reply.
>
> you could do something like
> insert into A select 'JSMITH','08-15-2005',8,'VAC'
> where
> 8 != (select sum(hours) FROM A
> WHERE emp = 'JSMITH'
> AND date = '8-15-2005');
Wouldn't that fail if JSMITH had only worked 7 hours on 8-15? I'm
guessing he'd still want it to fail since adding that 8 hours ov VAC would
result in a 15 hour day... so maybe something like?
insert into A select 'JSMITH','08-15-2005',8,'VAC'
WHERE
8 >= 8 + (select sum(hours) FROM A
WHERE emp = 'JSMITH'
AND date = '8-15-2005');
?