How to fetch the first record of each group of records?

srisyam · New User Joined: 30 May 2007 Posts: 2 Location: india

Hi,

I've a work request for which I need to retrieve the first row of each group of rows.

ColA ColB
a aaaaa
a aaa
b bb
b bbb
c cc
c cccc
c ccc

I want the output as

ColA ColB
a aaaaa
b bb
c cc

Can this be acheived by a single sql statement in DB2? I've tried searching the previous posts without success.

Sri..

Craq Giegerich · Posted: Thu Oct 25, 2007 8:25 pm

What defines the FIRST row of each group, is it colB, the order they were entered into the database, or some secret number? First, last, and ect. without something defining the order have not meaning with databases.

srisyam · New User Joined: 30 May 2007 Posts: 2 Location: india

Thank you.

Per my requirement it is enough if it fetches any one row out of the group of rows and It worked using the following query

SELECT DISTINCT COLA,MIN(COLB)
FROM TABLE
GROUP BY COLA

Regards, Sri..

shashikalayellenki · New User Joined: 15 Oct 2007 Posts: 1 Location: chennai

we can use fetch first one rows only in the cursor then we get the result right .