显示空值

Question

select min(code) as AC 
from Tab1e1 
where id=1 
Union 
select min(code) as AC          
from Table2 
where id=1

我得到的行如下

ac
--
101
null

但我不想要空行。我该怎么办？可以帮助我吗？

Answer 1

尝试为每个

添加此条件

and code is not null

像

select min(code) as AC from Tab1e1 where id=1 and code is not null 
Union 
select min(code) as AC from Table2 where id=1 and code is not null

因为代码值为空