From: | "tank(dot)zhang" <6220104(at)qq(dot)com> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Postgresql Sort cost Poor performance? |
Date: | 2019-04-01 10:30:09 |
Message-ID: | 1554114609808-0.post@n3.nabble.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
Thank you for your reply.
qis3_dp2=> SHOW lc_collate;
lc_collate
-------------
en_US.UTF-8
(1 row)
Time: 0.311 ms
qis3_dp2=>
qis3_dp2=> SELECT COUNT(DISTINCT SVIN) AS CHECKCARNUM ,SMTOC FROM
QIS_CARPASSEDSTATION A WHERE 1=1 AND A.SSTATIONCD = 'VQ3_LYG' AND
A.SLINYYY-MM-DD') AND A.DWORKDATE <= TO_DATE('2019-03-11','YYYY-MM-DD')
group by SMTOC
;
checkcarnum | smtoc
-------------+-----------------------
90 | HT6LHD700 NH731P A
690 | HT6LHD700 NH788P A
90 | HT6LHD700 R550P A
30 | HT6LHD700 YR615M A
1141 | HT6MHB700 NH731P A
Is there any possibility of optimization?
--
Sent from: http://www.postgresql-archive.org/PostgreSQL-performance-f2050081.html
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