我想在SQL Server 2008中使用INNER JOIN删除。

但我得到了这个错误:

消息156,级别15,状态1,第15行关键字“INNER”附近的语法不正确。

我的代码:

DELETE 
FROM WorkRecord2 
INNER JOIN Employee 
        ON EmployeeRun=EmployeeNo
WHERE Company = '1' 
    AND Date = '2013-05-06'

当前回答

您需要指定要从中删除的表。以下是具有别名的版本:

DELETE w
FROM WorkRecord2 w
INNER JOIN Employee e
  ON EmployeeRun=EmployeeNo
WHERE Company = '1' AND Date = '2013-05-06'

其他回答

这可能对你有帮助-

DELETE FROM dbo.WorkRecord2
WHERE EmployeeRun IN (
    SELECT e.EmployeeNo
    FROM dbo.Employee e
    WHERE ...
)

或者试试这个-

DELETE FROM dbo.WorkRecord2
WHERE EXISTS(
    SELECT 1
    FROM dbo.Employee e
    WHERE EmployeeRun = e.EmployeeNo
        AND ....
)

试试看:

DELETE FROM WorkRecord2 
       FROM Employee 
Where EmployeeRun=EmployeeNo
      And Company = '1' 
      AND Date = '2013-05-06'

您甚至可以执行子查询。喜欢下面的代码:

DELETE FROM users WHERE id IN(
    SELECT user_id FROM Employee WHERE Company = '1' AND Date = '2013-05-06'
)

您没有指定“公司”和“日期”的表,您可能想解决这个问题。

使用MERGE的标准SQL:

MERGE WorkRecord2 T
   USING Employee S
      ON T.EmployeeRun = S.EmployeeNo
         AND Company = '1'
         AND Date = '2013-05-06'
WHEN MATCHED THEN DELETE;

Devart给出的答案也是标准SQL,尽管不完整。它应该更像这样:

DELETE
  FROM WorkRecord2
  WHERE EXISTS ( SELECT *
                   FROM Employee S
                  WHERE S.EmployeeNo = WorkRecord2.EmployeeRun
                        AND Company = '1'
                        AND Date = '2013-05-06' );

关于上述内容,需要注意的重要一点是,很明显,删除的目标是单个表,正如第二个示例中通过要求标量子查询而强制执行的那样。

对我来说,各种专有语法答案更难阅读和理解。我想frans eilling的回答中最好地描述了的心态,即编写代码的人不一定关心将阅读和维护代码的人。

另一种方法是使用CTE:

;WITH cte
     AS (SELECT *
         FROM   workrecord2 w
         WHERE  EXISTS (SELECT 1
                        FROM   employee e
                        WHERE  employeerun = employeeno
                               AND company = '1'
                               AND date = '2013-05-06'))
DELETE FROM cte

注意:当您想要删除时,我们不能在CTE中使用JOIN。