Concat all column values in sql

Question

How to concat all column values from differenct rows returned from a sql query into one value? This is an example:

a query returns:

FOO
------
RES1

RES2
         


        

Answer 1

select cast(res1 as varchar)+cast(res2 as varchar)+cast(res3 as varchar) as fooconcat from foo

If the columns are already strings you do not need the cast, you can just do:

select res1 + res2 + res3  as fooconcat from foo

For data from multiple rows, use PIVOT.