如何在mysql中的同一列标题下填充两列

Question

如何使用SQL Query生成下表，其中CHEMISTRY，CA1，CA2，ExAM，TOT来自ChemTable，PHYSICS，CA1，CA2，ExAM，TOT，来自PhyTable和ENGLISH，CA1，CA2，ExAM， TOT来自EngTable。感谢

 __________________________________________________________________________
|       CHEMISTRY        |         PHYSICS        |     ENGLISH            |   
|________________________|________________________|________________________|
| CA1 | CA2 | EXAM | TOT | CA1 | CA2 | EXAM | TOT | CA1 | CA2 | EXAM | TOT |
|_____|_____|______|_____|_____|_____|______|_____|_____|_____|______|_____| 

Answer 1

您想要使用3种选择中的UNION：

SELECT "CHEMISTRY" as class,CA1,CA2, ExAM,TOT from Chemtable
UNION    
SELECT "PHYSICS" as class,CA1,CA2, ExAM,TOT from PhyTable    
UNION
SELECT "ENGLISH" as class,CA1,CA2, ExAM,TOT from EngTable

但实际上你想要规范你的表结构。