如何使用INER JOIN与SQL Server删除？

Question

我想INNER JOIN在SQL Server 2008中删除使用.

但我得到这个错误:

消息156,级别15,状态1,行15
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'

Answer 1

您需要指定要删除的表,这是带别名的版本:

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

Answer 2

只需添加的表名DELETE,并FROM从那里你要删除的记录,因为我们必须指定表中删除.还删除ORDER BY子句,因为删除记录时无需订购.

所以你的最终查询应该是这样的:

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

Answer 3

这可能对你有所帮助 -

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

或试试这个 -

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

Answer 4

试试这个:

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

Answer 5

它应该是:

DELETE zpost 
FROM zpost 
INNER JOIN zcomment ON (zpost.zpostid = zcomment.zpostid)
WHERE zcomment.icomment = "first"       

Answer 6

您甚至可以进行子查询。就像下面这段代码：

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

Answer 7

在SQL Server Management Studio中,我可以轻松创建SELECT查询.

SELECT Contact.Naam_Contactpersoon, Bedrijf.BedrijfsNaam, Bedrijf.Adres, Bedrijf.Postcode
FROM Contact
INNER JOIN Bedrijf ON Bedrijf.IDBedrijf = Contact.IDbedrijf

我可以执行它,并显示所有联系人.

现在将SELECT更改为DELETE:

DELETE Contact
FROM Contact
INNER JOIN Bedrijf ON Bedrijf.IDBedrijf = Contact.IDbedrijf

您将在SELECT语句中看到的所有记录都将被删除.

您甚至可以使用相同的过程创建更难的内部联接,例如:

DELETE FROM Contact
INNER JOIN Bedrijf ON Bedrijf.IDBedrijf = Contact.IDbedrijf
INNER JOIN LoginBedrijf ON Bedrijf.IDLoginBedrijf = LoginBedrijf.IDLoginBedrijf

Answer 8

这个版本应该有效

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

Answer 9

试试这个查询:

DELETE WorkRecord2, Employee 
FROM WorkRecord2 
INNER JOIN Employee ON (tbl_name.EmployeeRun=tbl_name.EmployeeNo)
WHERE tbl_name.Company = '1' 
AND tbl_name.Date = '2013-05-06';

Answer 10

 DELETE a FROM WorkRecord2 a 
       INNER JOIN Employee b 
       ON a.EmployeeRun = b.EmployeeNo 
       Where a.Company = '1' 
       AND a.Date = '2013-05-06'

Answer 11

使用的另一种方式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：如果需要，我们不能JOIN在内部使用。CTEdelete

Answer 12

试试这个，可能会有所帮助

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

Answer 13

您没有为Companyand指定表Date，您可能想要解决这个问题。

标准 SQL 使用MERGE：

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

Devart 的答案也是标准SQL，虽然不完整。它应该看起来更像这样：

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是针对单个表的，正如第二个示例中通过要求标量子查询强制执行的那样。

对我来说，各种专有语法答案更难阅读和理解。我想在frans eilering 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。

Answer 14

这是我目前用于删除甚至更新的内容：

DELETE           w
FROM             WorkRecord2   w,
                 Employee      e
WHERE            w.EmployeeRun = e.EmployeeNo
             AND w.Company = '1' 
             AND w.Date = '2013-05-06'

Answer 15

使用事务块、表变量和 JOIN 删除多个表数据。

BEGIN TRANSACTION;

   declare @deletedIds table ( id int );
   
   DELETE w
   output deleted.EmployeeRun into @deletedIds
   FROM WorkRecord2 w
   INNER JOIN Employee e
           ON e.EmployeeNo = w.EmployeeRun
          AND w.Company = 1
          AND w.date = '2013-05-06';

   DELETE e
   FROM Employee as e
   INNER JOIN @deletedIds as d
           ON d.id = e.EmployeeNo;
COMMIT TRANSACTION;

请从网址检查https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=43330dda6f1b71b8ec4172a24d5b6921

通过临时表和JOIN删除多表数据。删除后删除临时表。

BEGIN TRANSACTION;

    -- create temporary table
    create table #deletedRecords (employeeId int);
    
    -- INSERT INTO #deletedRecords
    SELECT e.EmployeeNo
    FROM WorkRecord2 w
    INNER JOIN Employee e
           ON e.EmployeeNo = w.EmployeeRun
          AND w.Company = 1
          AND w.date = '2013-05-06';
          
    -- delete from WorkRecord2
    DELETE w
    FROM WorkRecord2 w
    INNER JOIN #deletedRecords d
           ON w.EmployeeRun = d.employeeId;
           
    -- delete from Employee using exists
    DELETE 
    FROM Employee
    WHERE EXISTS (SELECT 1
                  FROM #deletedRecords d
                  WHERE d.employeeId = EmployeeNo);
                  
    -- drop temporary table
    DROP TABLE #deletedRecords;

COMMIT TRANSACTION;

请从网址https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=d52c6c1ed91669d68fcc6bc91cb32d78检查

使用 SELECT INTO 创建临时表的替代方法

BEGIN TRANSACTION;

    SELECT  e.EmployeeNo employeeId 
    INTO #deletedRecords
    FROM WorkRecord2 w
    INNER JOIN Employee e
           ON e.EmployeeNo = w.EmployeeRun
          AND w.Company = 1
          AND w.date = '2013-05-06';
          
    -- delete from WorkRecord2
    DELETE w
    FROM WorkRecord2 w
    INNER JOIN #deletedRecords d
           ON w.EmployeeRun = d.employeeId;
           
    -- delete from Employee using exists
    DELETE 
    FROM Employee
    WHERE EXISTS (SELECT 1
                  FROM #deletedRecords d
                  WHERE d.employeeId = EmployeeNo);
                  
    -- drop temporary table
    DROP TABLE #deletedRecords;

COMMIT TRANSACTION;

请从网址https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=0f02f05616ce5b4dcc8fc67c6cf1e640检查

使用JOIN删除单表数据

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

请从网址检查https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=84a60d1368556a8837281df36579334a

使用CTE删除单表数据

WITH cte AS (
     SELECT w.EmployeeRun
     FROM WorkRecord2 w
     WHERE EXISTS (SELECT 1
                   FROM Employee 
                   WHERE EmployeeNo = w.EmployeeRun)
         AND w.Company = 1
         AND w.date = '2013-05-06'
)
DELETE
FROM cte

请从网址https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=6590007b3c8c2ffad5563bd86606c5b1检查

在子表中创建外键期间使用ON CASCADE DELETE 。如果删除父表数据，则相应的子表数据也会自动删除。