facing problem in a sql query

Question

4.00/5 (1 vote)

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My table is look like

ID    PID     Value
1      1        1
2      1        2
3      1        3
4      1        4
5      2        1
6      2        2
7      2        3
8      3        1
9      3        2
10     4        1
11     4        2
12     5        1
13     6        1
14     7        1
15     7        2

i want to get the records as per the MAX value; just see the example there is all PID exists with their MAX value and it'll look like following:

ID    PID     Value
4      1        4
7      2        3
9      3        2
11     4        2
12     5        1
13     6        1
15     7        2

How could i get this above following result using SQL?
Please help me to solve this.

Thanks in advance.

Posted 8-Nov-12 22:21pm

sahabiswarup

Updated 8-Nov-12 22:43pm

v3

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Comments

psychic6000 9-Nov-12 4:29am

whats special? on which bases you are selecting or ignoring rows?

sahabiswarup 9-Nov-12 4:30am

i want to get the records as per the MAX value; just see the example there is all PID exists with their MAX value

Herman<T>.Instance 9-Nov-12 11:06am

next time please tell which sql server you are using.

3 solutions

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OriginalGriff · Accepted Answer · 2012-11-08T23:05:00

Solution 1

Try:

SQL

SELECT ID, PID, Value
FROM MyTable T1
WHERE Value =
   ( SELECT MAX(Value) FROM MyTable T2
     WHERE T1.PID=T2.PID
    )
ORDER BY T1.PID

Posted 8-Nov-12 23:05pm

OriginalGriff

Comments

sahabiswarup 9-Nov-12 5:38am

Thanks a lot OriginalGriff

OriginalGriff 9-Nov-12 5:42am

You're welcome!

Maciej Los 9-Nov-12 11:46am

A 5!
I was a little bit late ;)

Maciej Los · Accepted Answer · 2012-11-08T23:05:00

Solution 2

It should works:

SQL

SELECT T2.[ID], T1.[PID], T1.[Value]
FROM (
    SELECT [PID], MAX([Value]) AS [Value]
    FROM YourTable
	GROUP BY [PID]
    ) AS T1 LEFT JOIN (
		SELECT [ID], [PID], [VALUE]
		FROM YourTable
		) AS T2 ON T1.PID = T2.PID AND T1.[Value]=T2.[Value]

Posted 8-Nov-12 23:05pm

Maciej Los

Comments

sahabiswarup 9-Nov-12 5:38am

Thanks a lot Maciej Los

Maciej Los 9-Nov-12 11:46am

You're welcome!

Herman<T>.Instance · Accepted Answer · 2012-11-09T04:52:00

Solution 3

You can use the Row_Number function when using MS SQl Server 2005 and up

SQL

select detail.ID, detail.PID, detail.Value
FROM
(
  SELECT Row_Number() over (partition by PID, Value order by PID, Value desc) as rowno,
  ID, PID, Value FROM MyTable
) as detail
where detail.rowno = 1

Posted 9-Nov-12 4:52am

Herman<T>.Instance

Comments

OriginalGriff 9-Nov-12 11:56am

Very nice - I hadn't thought of that.