what is set code example

Example 1: set operations

UNION ALL:
COMBINES THE RESULT OF 2 QUERY AND
DOESN'T REMOVE DUPLICATE ROWS
AND DOESN'T SORT BY FIRST COLUMN

UNION:
COMBINES THE RESULT OF 2 QUERY AND
REMOVES DUPLICATE ROWS AND
SORTS BY FIRST COLUMN 

MINUS:
MINUS RETURNS THE LEFT NON MATCHING
DATA AS A RESULT.


INTERSECT:
BASICALLY INTERSECT COMBINES COMMON
ELEMENTS OF BOTH TABLES

Example 2: what is set

SET: Can only store unique values, 
     And does not maintain order
- HashSet can have null, order is not guaranteed
- LinkedHashSet can have null and keeps the order 
- TreeSet sorts the order and don't accept null

Tags:

Misc Example

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