SQL use comma-separated values with IN clause

Question

I am developing an ASP.NET application and passing a string value like \"1,2,3,4\" into a procedure to select those values which are IN (1,2,3,4) but its saying \"Conversion

Answer 1

It is not possible to put those values (the comma separated string) in a parameter-value.

What you'll have to do, is to create the SQL Statement in your stored procedure dynamically, by string concatenation. You'll have to execute it with the sp_executesql stored procedure then.

 CREATE PROCEDURE [dbo].[getUserRoles]( @groupIds NVARCHAR(50) ) 
 AS BEGIN   
    DECLARE @statement NVARCHAR(255)

    SELECT @statement = N'SELECT * FROM CheckList_Groups Where id in ( ' + @pGroupIDs + N')'    

    execute sp_executesql @statement 
 END

Also, not that I named the SP getUserRoles instead of sp_getUserRoles. The reason is very simple: when you execute a stored procedure whose name starts with sp_, then SQL Server will first query the master database to find that stored procedure, which causes a performance hit offcourse.