Many thanks to all who pointed out the usefulness of the 'ANALYZE' command
in my last question. I assumed the db admin was doing 'VACUUM ANALYZE'
after each days insert but he wasn't.
Is there a shorthand notation when performing a multi-table join and one
column is to be equaled in all tables? i.e. the following gets tedious to
write:
select tq1.timestamp as t, tq1.value as q1, tq2.value as q2,
tq3.value as q3, tq4.value as q4 from
cal_quat_1 tq1, cal_quat_2 tq2, cal_quat_3 tq3, cal_quat_4 tq4
where tq1.timestamp = tq2.timestamp
and tq1.timestamp = tq3.timestamp
and tq1.timestamp = tq4.timestamp
and tq2.timestamp = tq3.timestamp
and tq2.timestamp = tq4.timestamp
and tq3.timestamp = tq4.timestamp
and tq1.timestamp > '2004-01-12 09:47:56.0000 +0'::timestamp with timezone
and tq1.timestamp < '2004-01-12 09:50:44.7187 +0'::timestamp with timezone
order by tq1.timestamp;
Each timestamp is indexed so the above is actually quite quick.
Nevertheless, the syntax of equating each table's timestamp to the others
is rather verbose.
Cheers,
Randall
