From: | Yury Don <yura(at)vpcit(dot)ru> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: |
Date: | 2000-10-30 12:55:04 |
Message-ID: | 18130913295.20001030175504@vpcit.ru |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
Hello Lengyel,
Once, Monday, October 30, 2000, 5:36:23 PM, you wrote:
LF> Hello everybody!
LF> I need some help with a simple query.
LF> I've got a problem with getting a maximum value from a very large table
LF> (10000000+ rows):
LF> I have table:
LF> CREATE TABLE TABLE_A
LF> (
LF> COL1 INT,
LF> COL2 INT,
LF> CONSTRAINT PK PRIMARY KEY (COL1, COL2)
LF> )
LF> and when I want to get the maximum value for col1:
LF> SELECT MAX(COL1) FROM TABLE_A WHERE COL2 = 1
LF> it takes a large amount of time.
LF> I created an index on column COL1, but it doesn't work.
You need to create index on COL2.
--
Best regards,
Yury ICQ 11831432
mailto:yura(at)vpcit(dot)ru
From | Date | Subject | |
---|---|---|---|
Next Message | Carl Shelbourne | 2000-10-30 13:17:24 | Synonyms |
Previous Message | Schlobohm, Jack | 2000-10-30 12:52:28 | RE: |