来自3个表的条目的总和

Question

I have 5 mysql tables with the same layout:

name|||||||||points
-------------------
name1|10
name2|9
name3|11

...

I want to get the sum from all tables from a user so the result should be like this:

name|||||||||points
-------------------
name1|90
name2|59
name3|61
...

But my problem is, that some tables may not contain name1 for example, so a name can also be in 5 tables or in 1.

Answer 1

SELECT Q.Name, SUM(Q.POINTS_COLUMN) Total
FROM
 (
  SELECT Name , POINTS_COLUMN  FROM TABLE_ONE
  UNION ALL 
  SELECT Name , POINTS_COLUMN  FROM TABLE_TWO
  UNION ALL 
  SELECT Name , POINTS_COLUMN  FROM TABLE_THREE
  UNION ALL 
  SELECT Name , POINTS_COLUMN  FROM TABLE_FOUR
  UNION ALL 
  SELECT Name , POINTS_COLUMN  FROM TABLE_FIVE
  ) Q
GROUP BY Q.NAME