[Forward] SQL UNION ALL


SQL UNION ALL is combine the results of two
queries together without filter out the same value(no distinct behavior).

The difference between UNION ALL and
UNION is UNION
only selects distinct values and UNION ALL selects all
values.


Syntax -
UNION ALL
(SQL Statement 1)
UNION ALL
(SQL Statement
2)


Below is example for SQL
UNION




















Company

Sales($)

Website

Sql Traniner 2500 http://www.sqltutorials.blogspot.com
BeautyCentury 3000 http://beautycentury.blogspot.com
TravelYourself 2800 http://travelyourself.blogspot.com
Table1














Sales

Website

2900 http://www.sqltutorials.blogspot.com
3000 http://beautycentury.blogspot.com
2800 http://travelyourself.blogspot.com
Table2

SQL UNION ALL Statement
SELECT Sales FROM TABLE1
UNION ALL
SELECT Sales FROM TABLE2

Result
















Sales
2500
3000
2800
2900
3000
2800

你可能感兴趣的:(UNION ALL)