How to get top 1 record from unique parentid and batch id

Question

4.00/5 (2 votes)

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SQL-server-2000

SQL-Server-2005

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Hi all,

I have data in a table as:

FileId	ParentId	BatchId
1	1	1
2	1	1
3	1	1
4	2	1
5	2	1
6	2	1
7	3	1
8	3	1
9	3	1
10	4	1

I want top 1 fileid on the basis of parentid and batcid.

The output should be as below

FileId	ParentId	BatchId
1	1	1
4	2	1
7	3	1
10	4	1

[edit]Code block added - OriginalGriff[/edit]

Posted 20-Dec-13 20:57pm

Mohd Wasif

Updated 20-Dec-13 22:24pm

OriginalGriff

v2

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♥…ЯҠ…♥ 21-Dec-13 3:45am

Nice question 5+

2 solutions

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Amir Mahfoozi · Answer 1 · 2013-12-20T22:25:00

Solution 1

Here it is :

SQL

select t.fileid, t.parentid, batchid from
(select *, row_number() over (partition by parentid, batchid order by fileid) rno from tablename) t
where rno =1

Replace tablename with your table name.

Good Luck

Posted 20-Dec-13 22:25pm

Amir Mahfoozi

OriginalGriff · Answer 2 · 2013-12-20T22:32:00

Solution 2

Try:

SQL

SELECT a.FileId, a.ParentId, a.BatchId FROM MyTable a
JOIN (SELECT MIN(FileId) AS FileId FROM MyTable GROUP BY ParentId) b
ON a.FileId=b.FileId

Posted 20-Dec-13 22:32pm

OriginalGriff