how use distinct in tsql

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iam use this table with this query

HTML

FUserName	FScoreID	FGrantedScoreID
u157	            2                6
u157	            2	              7
u4	            2	             10
u4	            2	             11
u4	            2	             12
u6	            2	            14
u6	            2	            15
u6	            2	            18

iam need this result

XML

<pre lang="HTML">
FUserName   FScoreID    FGrantedScoreID
u157            2                6
u4              2                10
u6              2                14

</pre>

this query

SQL

SELECT DISTINCT FUserName,FScoreID , [FGrantedScoreID]

  FROM [HrstPortal].[dbo].[VDB_Scores]
 where FScoreID=2

Posted 21-Nov-14 20:53pm

saeed1364

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4 solutions

Solution 2

The problem is that there is no easy way to get the "first" row of each "group" without having anything in the table to order it by - since SQL is at liberty to return rows in any order it sees fit unless an ORDER BY clause is added.
But...see here: http://stackoverflow.com/questions/3800551/select-first-row-in-each-group-by-group[^]

Posted 21-Nov-14 21:09pm

OriginalGriff

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Afzaal Ahmad Zeeshan · Accepted Answer · 2014-11-21T21:04:00

The above query would return only one row, because the FScoreID is same throughout the table.

You can create two queries. One would select the DISTINCT data, and the second one can be used inside a loop, to see for the data present for each of this DISTINCT data.

Try this,

SQL

SELECT DISTINCT FUserName, [FGrantedScoreID] -- Select
FROM [HrstPortal].[dbo].[VDB_Scores] -- Table 
WHERE FScoreID=2 -- Constraint

Now for this result, you can loop and run a query for the FUserName value, and get all of the FScoreID values for each of the DISTINCT result; as you're doing in the HTML table.

Peter Leow · Accepted Answer · 2014-11-21T21:13:00

Solution 3

Try this:

SQL

select t1.* from tablename t1
inner join
(
  select FUserName,MIN(FGrantedScoreID) MinFGrantedScoreID from tablename group by FUserName
) t2
on t1.FUserName=t2.FUserName
where t1.FGrantedScoreID=t2.MinFGrantedScoreID

Posted 21-Nov-14 21:13pm

Peter Leow

Maciej Los · Accepted Answer · 2014-11-22T00:26:00

Solution 4

The simplest query is:

SQL

SELECT FUserName, FScoreID, MIN(FGrantedScoreID) AS FGrantedScoreID
FROM TableName
WHERE FScoreID = 2
GROUP BY FUserName, FScoreID

See:
Aggregate Functions (Transact-SQL)[^] - MIN[^]

Posted 22-Nov-14 0:26am

Maciej Los