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

 
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srisyam

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Joined: 30 May 2007
Posts: 2
Location: india

PostPosted: Thu Oct 25, 2007 7:45 pm    Post subject: How to fetch the first record of each group of records?
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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..
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Craq Giegerich

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Joined: 19 May 2007
Posts: 1512
Location: Virginia, USA

PostPosted: Thu Oct 25, 2007 8:25 pm    Post subject:
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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.
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srisyam

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Joined: 30 May 2007
Posts: 2
Location: india

PostPosted: Fri Oct 26, 2007 9:55 am    Post subject:
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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..
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shashikalayellenki

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Joined: 15 Oct 2007
Posts: 1
Location: chennai

PostPosted: Fri Oct 26, 2007 1:47 pm    Post subject: I need to retrieve the first row of each group of rows.
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we can use fetch first one rows only in the cursor then we get the result right .
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