How can I insert the result of a SQL query in a varchar variable?

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SQL-Server-2008R2

Hi, this is my question:

I execute this query:

SQL

SELECT CODE FROM MyTable

This is the result:

CODE
1
2
5
9

How can I insert the result in a varchar variable?:

@CODES='1,2,5,9'

I thought go row by row with a "FOR" cycle, but I don't know how to do it.

thanks.

Posted 20-Mar-15 7:53am

judah9107

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ZurdoDev · Accepted Answer · 2015-03-20T08:11:00

Solution 1

You can actually use COALESCE to do this. If you google for "sql concatenate rows" you get lots of examples:

For example:

SQL

DECLARE @Codes NVARCHAR(MAX) 
SELECT @Codes = COALESCE(@Codes + ', ', '') + Code
FROM MyTable

Posted 20-Mar-15 8:11am

ZurdoDev

judah9107 · Accepted Answer · 2015-03-20T08:21:00

Yeaaahhh !!! that's the solution!!! a lot of thanks Ryan. :D

I had to do a little change because "Code" field was declared as integer, I had to convert this field to a Varchar and that's it:

this is my Solution:

SQL

DECLARE @Codes NVARCHAR(MAX) 

SELECT @Codes = COALESCE(@Codes + ', ', '') + CONVERT(varchar,Code)
FROM MyTable

SELECT @Codes