Return all possible combinations of values on columns in SQL

Question

How do I return a list of all combinations of values in 2 columns so they are new rows in T-SQL?

e.g.

Col1, Col2
----  ----
1     2
1     4
1     5
<         


        

Answer 1

You could cartesian join the table to itself, which would return all combinations of both columns.

select 
    distinct
    t1.Col1,
    t2.Col2
from 
    MyTable t1,
    MyTable t2