Hi Nelson:
On Wed, Jan 8, 2014 at 4:54 PM, Nelson Green <nelsongreen84@gmail.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.