Copy Column A from Table 1 and column B from Table 2 into Table 3 columns A and B

Question

I have table 3, with columns A and B. I want to do an insert, where A is a column I will copy from table 1, and B is a column from table 2.

What I know works:

INSERT INTO TABLE3(A)
SELECT A
FROM TABLE1

What I want:

INSERT INTO TABLE3(A, B)
SELECT A
FROM TABLE1
SELECT B
FROM TABLE2

Answer 1

Do you want every combination of A and B? In that case:

INSERT INTO TABLE3 (A, B)
SELECT TABLE1.A, TABLE2.B
FROM TABLE1, TABLE2