如何添加来自2个查询的值

Question

从1 ^日查询我得到一些价值和2 ^次查询我得到一些价值.我想要两个值的总和.

查询1:

select sum(EAmount) from EstimateAmount where pid='3' group by pid

查询2:

select sum(OPEAmount) from OPEAmount where pid='3' group by pid

Answer 1

select 

(select sum(EAmount) from EstimateAmount 
where pid='3' 
group by pid) 
+ 
(select sum(OPEAmount) from OPEAmount 
where pid='3' 
group by pid)