选择查询Ms访问中的子查询

Question

我可以在ms中添加子查询，例如：

select field1,field2,field3, 
(select field4 from table2 where field5 = field3)  from table1

我尝试了相同的操作，子查询为每一行带来了值。我只需要在field5 = field3

时显示值

Answer 1

根据您的意见，你可以试试这个

Select field1, field2,field3 + (select
IIF(IsNull(sum(field4)),0,sum(field4)) from table2 where table2field5 = 
table2.fields3) from table1

尝试两个表之间的左连接

select table1.field1,table1.field2,table1.field3,table2.field4
from table1 left outer join table2 on
 table1.field5= table2.field3

你可以尝试这样，我认为你正在尝试子查询，你正在尝试copare table1列到table2列

select field1,field2,field3, 
 (select field4 from table2 where table2. field5 = field3) from table1

或

select field1,field2,field3,
  (select field4 from table2 where field5 = table2.field3) from table1