Question

我有这张桌子：

StudentId | ConfigurationTypeId
1         | 1
1         | 2
1         | 3
2         | 1
2         | 2

我想在ConfigurationTypeId = 3

时删除此表中的所有记录

所以我提出了这个问题：

DELETE FROM [StudentConfigurationType] WHERE StudentId IN
  (SELECT StudentId FROM [StudentConfigurationType] SCT 
  INNER JOIN [Student] S ON S.Id = SCT.StudentId
  WHERE SCT.ConfigurationTypeId = 3 AND S.RegisteredDate < '2014-09-18')

但是，因为这个表没有Id，所以StudentId进来了，它从表中删除了所有记录。如何制作这样的东西：

DELETE FROM [StudentConfigurationType] WHERE StudentId AND ConfigurationTypeId IN
  (SELECT StudentId, ConfigurationTypeId FROM [StudentConfigurationType] SCT
  INNER JOIN [Student] S ON S.Id = SCT.StudentId
  WHERE SCT.ConfigurationTypeId = 3 AND S.RegisteredDate < '2014-09-18')

Answer 1

你可以试试这个：

DELETE FROM [StudentConfigurationType] WHERE (StudentId, ConfigurationTypeId) IN
  (SELECT StudentId, ConfigurationTypeId FROM [StudentConfigurationType] SCT
  INNER JOIN [Student] S ON S.Id = SCT.StudentId
  WHERE SCT.ConfigurationTypeId = 3 AND S.RegisteredDate < '2014-09-18');

或者这个：

DELETE FROM [StudentConfigurationType] 
WHERE StudentId IN (SELECT StudentId 
                      FROM [StudentConfigurationType] SCT
                           INNER JOIN [Student] S ON S.Id = SCT.StudentId
                      WHERE S.RegisteredDate < '2014-09-18')
 AND ConfigurationTypeId = 3;

或者这个：

DELETE FROM [StudentConfigurationType] st
WHERE EXISTS (SELECT 1 FROM [Student] S WHERE S.Id = ST.StudentId AND S.RegisteredDate < '2014-09-18')
 AND ConfigurationTypeId = 3;

从WHERE IN删除，但有2个字段，没有Id

1 个答案: