From: | Francisco Olarte <folarte(at)peoplecall(dot)com> |
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To: | Nelson Green <nelsongreen84(at)gmail(dot)com> |
Cc: | pgsql <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Last inserted row id with complex PK |
Date: | 2014-01-08 16:09:22 |
Message-ID: | CA+bJJbyFHG8fDDPGeWpujW=6uiT24E_vkSqN7tsqwzOLgXyBrw@mail.gmail.com |
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Lists: | pgsql-general |
Hi Nelson:
On Wed, Jan 8, 2014 at 4:54 PM, Nelson Green <nelsongreen84(at)gmail(dot)com> wrote:
> I have a projects log table with a three column PK, project_num, person_num,
> and sequence, where each new entry for a project/person combination
> increments the sequence, which is not an auto incrementing sequence. Is
> there any way to retrieve the last entry to the table? For instance, if the
> last entry for person 427 on project 15 was sequence number 125, is that
> information available to me anywhere?
SELECT MAX(sequence) FROM project_log_table WHERE person_num=427 AND
project_num=15
If it's a PK it should have an index and I believe it will be quite fast.
AAMOF, you could even build the above with max+1 into the insert query
for a new entry and have the values returned using a RETURNING clause.
Francisco Olarte.
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