我能用删除第一个加入SQL

Question

不知是SQL下面的查询有效：

DELETE FROM Reporters 
JOIN Cases ON Reporters.CaseId = Cases.ID 
WHERE Cases.Court = @Court 

我得到一个错误：

Incorrect syntax near join

Answer 1

提从中，你想从删除表。 （该解决方案特定于SQL Server）

DELETE re --if you wanted to delete the cases replace `re` with `ca` 
FROM Reporters re 
JOIN Cases ca ON re.CaseId = ca.ID 
    WHERE ca.Court = @Court 

Answer 2

DELETE r 
FROM reporters as r 
INNER JOIN cases as c 
ON r.CaseId = c.ID 
    WHERE c.Court = @Court 

Answer 3

可以呀，你只需指定别名到您的表格并删除使用它：

DELETE R 
-- SELECT * 
FROM Reporters AS R 
INNER JOIN Cases AS C 
    ON R.CaseId = C.ID 
WHERE C.Court = @Court ; 

Answer 4

如果你像表一样使用表，它将会工作;

DELETE r 
FROM Reporters AS r 
INNER JOIN Cases AS c 
    ON r.CaseId = c.ID 
WHERE c.Court = @Court 

或者你可以使用

DELETE FROM Reporters 
WHERE EXISTS (SELECT 1 FROM Cases WHERE Cases.ID = Reporters.CaseId AND Cases.Court = @Court)