If you want to just find which rows are in one table and not in the other, you can use the EXCEPT keyword. For example:SELECT * FROM table_3
EXCEPT
SELECT * FROM table_4;
Or vice versa for finding rows that are in table_4, but not in table_3. INTERSECT keyword will let you pick up rows that are common in both tables.
If you want to compare the values side by side, you can do a full join on the two tables like this:SELECT
COALESCE(t3.col_1,t4.col_1) AS col_1,
t3.MaxCol AS T3MaxCol,
t4.MaxCol AS T4MaxCol
FROM
table_3 t3
FULL JOIN table_4 t4 ON
t3.col_1 = t4_col1;