1UNION ALL:
2COMBINES THE RESULT OF 2 QUERY AND
3DOESN'T REMOVE DUPLICATE ROWS
4AND DOESN'T SORT BY FIRST COLUMN
5
6UNION:
7COMBINES THE RESULT OF 2 QUERY AND
8REMOVES DUPLICATE ROWS AND
9SORTS BY FIRST COLUMN
10
11MINUS:
12MINUS RETURNS THE LEFT NON MATCHING
13DATA AS A RESULT.
14
15
16INTERSECT:
17BASICALLY INTERSECT COMBINES COMMON
18ELEMENTS OF BOTH TABLES
19
20
21
22
23