SQL UNION ALL

QL UNION ALL is query that allows you to select related information from 2 tables, the result is different from the UNION statement. It return all the record from SELECT statement that used.

UNION ALL selects all rows from each table and combines them into a single table.

The syntax is as follows:

SELECT [COLUMN NAME 1], [COLUMN NAME 2],… FROM [TABLE NAME 1]
UNION ALL

SELECT [COLUMN NAME 1], [COLUMN NAME 2],… FROM [TABLE NAME 2]


EXAMPLE :

We have 2 table name GamesScores, GameScores_new.

Table GameScores

PlayerName	Department	Scores
Jason	IT	3000
Irene	IT	1500
Jane	Marketing	1000
David	Marketing	2500
Paul	HR	2000
James	HR	2000

Table GameScores_new

PlayerName	Department	Scores
Jason	IT	3000
David	Marketing	2500
Paul	HR	2000
James	HR	2000

SQL statement :

SELECT PlayerName FROM GameScores

UNION ALL

SELECT PlayerName FROM GameScores_new

Result:

PlayerName

Jason

Irene

Jane

David

Paul

James

Jason

David

Paul

James