join comma delimited data column

Question

my table1 is :

T1

col1    col2
 C1     john
 C2     alex
 C3     piers
 C4     sara

and so table 2:

T2

Answer 1

If you wanted to do this task in oracle we can use listagg and can accomplish this easily.

A possible equivalent available in SQL Server for listagg is Stuff

So using stuff you can try with following query:

SELECT T2.Col1,
       Stuff((SELECT ',' + CAST(T1.Col2 AS VARCHAR(100))
               FROM T1
              WHERE T2.Col2 LIKE T1.Col1
                FOR Xml Path('')),
             1,
             1,
             '')
  FROM T2