有两个仓库,有
仓库A
bookname       price
---------------------
Delphi         37.5
VB             24.0仓库B
bookname       price
---------------------
VC             43.0
Java           37.8怎么写SQL才能得到这样的结果
bookname       price
---------------------
Delphi         37.5
VB             24.0
VC             43.0
Java           37.8