Question

I have a table with:

id | parameter
 1 | A
 1 | B
 2 | A
 3 | A
 3 | B

That represent objects defined with the values as:

 1 -> A,B
 2 -> A
 3 -> A,B

I want to count the number of objects with different parameters using a SQL query, so in this case it would be 2 unique objects as 1 and 3 have the same parameters.

There is no constraint on the number of parameters, there can be 0, or any other number.

The database is a Microsoft SQL Server 2000. But I do not mind knowing the solution for other databases.

Answer 1

I resolved the problem with the link Cheran S provided (as Microsoft SQL Server still does not have a GROUP_CONCAT() function)
http://dataeducation.com/rowset-string-concatenation-which-method-is-best/