对多个表中的多个值求和

Question

我想做一个SQL查询来获取一个和号,但我不知道如何构造这个查询.

select count(*) from table1 where commom_fk in (1234);
select count(*) from table2 where commom_fk in (1234);
select count(*) from table3 where commom_fk in (1234);
select count(*) from table4 where commom_fk in (1234);
select count(*) from table5 where commom_fk in (1234);

我想在一个查询中总结这些结果,这是一种方法吗？

谢谢你们.-----*

这回答了.但是,如果我想用多个common_fk做这件事？

Answer 1

SELECT     
      ( SELECT ...)
    + ( SELECT ...)
    + ( SELECT ...)
    + ( SELECT ...)
    + ( SELECT ...)    
  AS sumAll

或者拥有全部5个结果:

SELECT     
      ( SELECT ...) AS sum1
    , ( SELECT ...) AS sum2
    , ( SELECT ...) AS sum3
    , ( SELECT ...) AS sum4
    , ( SELECT ...) AS sum5