UNION Statement in SQL

Request 1:

SELECT field1, field2 FROM table1
            

1, 'test'
2, 'test2'
            
Request 2:

SELECT field3, field6 FROM table2
            

1, 'test3'
2, 'test5'
            
UNION:

SELECT field1, field2 FROM table1
UNION
SELECT field3, field6 FROM table2
            

1, 'test'
2, 'test2'
1, 'test3'
2, 'test5'