sql - SQL 查询表达式中的错误

Question

我正在尝试在 access 2010 上运行以下 SQL 代码，但它在查询表达式中返回语法错误。有什么想法可能导致它吗？

提前致谢。

DELETE FROM Trn_done 
WHERE (Trn_done.training = 
SELECT Training  
FROM Trainings 
WHERE (Trainings.Area = '" & Area & "'))

Answer 1

您不应该 EQUAL 选择语句，以免选择中的多行导致代码中断。试试这个：

DELETE td 
from Trn_done td
inner join Trainings t 
on td.training = t.training
WHERE t.Area = '" & Area & "'

Answer 2

括号应该在嵌套 SQL 之前，如下所述

DELETE FROM Trn_done
WHERE Trn_done.training IN (
    SELECT Training 
    FROM Trainings
    WHERE (Trainings.Area = '" & Area & "')
)