Question

I have 2 tables. In table1 I have 2 columns — cust_npa & cust_nxx. In table2, I have 2 columns — valid_npa & valid_nxx. Each entry in table2.valid_npa has a corresponding entry in table2.valid_nxx.

valid_npa   valid_nxx
201         551
201         552
201         553
202         851
202         852

I wish to return all the rows in table1 that have a combination of valid_nap & valid_nxx from table2.

For example, a row in table1 that has cust_npa of 201 and cust_nxx of 852 would not be returned (as this is not a valid combination from table2).

Answer 1

select * from table_A as A
inner join table_B as B
on A.id = B.id and A.name = B.name