Re: Postgresql Sort cost Poor 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?

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Sent from: http://www.postgresql-archive.org/PostgreSQL-performance-f2050081.html