SQL how to compare two columns from two different tables

Question

I have two tables, in which table 1 contains 4 columns while table 2 contains 8 columns. I have two columns in table1 that I want to compare them with two columns in table2.

Answer 1

Except shows the difference between two tables (the Oracle guys use minus instead of except and the syntax and use is the same). It is used to compare the differences between two tables. For example, let's see the differences between the two tables

SELECT * FROM
 table1
EXCEPT
SELECT * FROM
 table2