Query - restricting rows based on specific combinations of columns
I have two columns in two different tables T1 and T2 like below
T1.Column1 T2.Column2
------------ ---------------
1 a
2 b
3 c
4 d
5 e
I need all the combinations of values in the columns, which I can choose like
select T1.Column1, T2.Column2 from T1, T2 ------ (Without specifying any join ie. cartesian product)
But, in those, combinations, I need to restrict the following combinations, from not being selected - (1,b), (1,c),(3,b), in the same sql, or using a subquery. I am not able to achieve this after several attempts. Can any one help?