combine multiple rows into one row in sql server

Question

3.00/5 (1 vote)

See more:

There are three rows

      Id  marks 
Row1: 1   15   
Row2: 1   16   
Row3: 1   17

and I want to merge all the three rows into a single row, can anybody help me please!!!!

output should be like below

      Id  marks1 marks2 marks3 
Row1: 1       15   16      17

please help me..
thank you.

Posted 6-Jun-12 9:35am

allagi.arun

Updated 6-Jun-12 9:42am

Nikfazan

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Stephen Hewison · Accepted Answer · 2012-06-06T09:58:00

It sounds like you need to "pivot"

Using the PIVOT sql command you can rotate and restructure the data although I'm not sure you can get it working for n columns as a static query.

You need an extra id in the marks table so each mark against each id has own sequence too. So the primary key would be id, markid.

SQL

      Id  MarkId  Mark
Row1  1   1       15
Row2  1   2       16
Row3  1   3       17
Row4  2   1       25
Row5  2   2       26
Row6  2   3       27

You can then use PIVOT to rotate the selection.

SQL

SELECT Id, [1], [2], [3]
FROM
    (SELECT Id, MarkId, Mark FROM MarksTable) AS SourceTable
    PIVOT
    (Min(Mark) FOR MarkId IN ([1], [2], [3])) AS PivotTable

This will output like this:

SQL

Id  "1"  "2"  "3"
1   15   16   17
2   25   26   27

The following is a full copy and paste script which follows your example and works:

SQL

SELECT Id = 1, MarkId = 1, Mark = 15 INTO #Temp UNION
SELECT Id = 1, MarkId = 2, Mark = 16 UNION
SELECT Id = 1, MarkId = 3, Mark = 17 UNION
SELECT Id = 2, MarkId = 1, Mark = 25 UNION
SELECT Id = 2, MarkId = 2, Mark = 26 UNION
SELECT Id = 2, MarkId = 3, Mark = 27

SELECT * FROM #Temp

SELECT Id, [1], [2], [3]
FROM
    (SELECT Id, MarkId, Mark FROM #Temp) AS SourceTable
    PIVOT
    (Min(Mark) FOR MarkId IN ([1], [2], [3])) AS PivotTable

DROP TABLE #Temp

Using a dynamic query you can build up a select for n number of marks by generating the SQL on the fly and running it using SP_ExecuteSQL.

The following article shows how to build a PIVOT query using dynamic SQL

http://www.simple-talk.com/community/blogs/andras/archive/2007/09/14/37265.aspx[^]