sql - 使用带有 WHERE 条件的单个查询 (SQL Express 2005) 从多个表中删除行

Question

这是我正在使用的查询：

 DELETE TB1.*, TB2.*
   FROM TB1
        INNER JOIN TB2 ON TB1.PersonID = TB2.PersonID 
  WHERE (TB1.PersonID)='2'

它在 MS Access 中运行良好，但在 SQL Server Express 2005 中出现错误（','.附近的语法不正确）。

如何解决？请帮忙。

Answer 1

您不能DELETE从多个表中使用单个表达式SQL 2005- 或任何其他标准 SQL。Access是这里的例外。

获得这种效果的最佳方法是FOREIGN KEYS在表之间指定一个ON DELETE trigger.

Answer 2

为什么你不使用 a DELETE CASCADE FK？

Answer 3

这不能在一个声明中完成。您将不得不使用 2 个语句

DELETE FROM TB1 WHERE PersonID = '2';
DELETE FROM TB2 WHERE PersonID = '2';

Answer 4

据我所知，你不能在一个句子中做到这一点。

但是您可以构建一个存储过程，在事务中的任何表中执行您想要的删除，几乎相同。

Answer 5

我认为您不能一次从多个表中删除（尽管我不确定）。

但是，在我看来，最好通过级联删除的关系来实现此效果。如果您这样做，您将能够从一个表中删除记录，而另一个表中的记录将被自动删除。

例如，假设这两个表代表一个客户，以及客户的订单。如果您将关系设置为级联删除，您只需删除客户表中的记录，订单将自动删除。

请参阅有关级联引用完整性约束的 MSDN 文档。

Answer 6

为引用master主键的明细表指定外键并设置Delete rule = Cascade。

现在，当您从主表中删除一条记录时，所有其他基于删除行主键值的详细表记录将被自动删除。

因此，在这种情况下，主表的单个删除查询可以删除主表数据以及子表数据。

Answer 7

在程序中使用它

declare cu cursor for SELECT [name] FROM sys.Tables where [name] like 'tbl_%'
declare @table varchar(100)
declare @sql nvarchar(1000)

OPEN cu  
FETCH NEXT FROM cu INTO @table 

WHILE @@FETCH_STATUS = 0  
BEGIN  
    set @sql = N'delete from ' + @table
    EXEC sp_executesql @sql
    FETCH NEXT FROM cu INTO @table 
END   
CLOSE cu;  
DEALLOCATE cu;

Answer 8

我用它来清理测试/开发数据库中的数据。您可以按表名和记录数进行过滤。

DECLARE @sqlCommand VARCHAR(3000);
DECLARE @tableList TABLE(Value NVARCHAR(128));
DECLARE @TableName VARCHAR(128);
DECLARE @RecordCount INT;

-- get a cursor with a list of table names and their record counts
DECLARE MyCursor CURSOR FAST_FORWARD
FOR SELECT t.name TableName,
           i.rows Records
    FROM sysobjects t,
         sysindexes i
    WHERE 
          t.xtype = 'U'              -- only User tables
          AND i.id = t.id          
          AND i.indid IN(0, 1)       -- 0=Heap, 1=Clustered Index
          AND i.rows < 10            -- Filter by number of records in the table
          AND t.name LIKE 'Test_%';  -- Filter tables by name. You could also provide a list:
                                     -- AND t.name IN ('MyTable1', 'MyTable2', 'MyTable3');
                                     -- or a list of tables to exclude:
                                     -- AND t.name NOT IN ('MySpecialTable', ... );

OPEN MyCursor;

FETCH NEXT FROM MyCursor INTO @TableName, @RecordCount;

-- for each table name in the cursor, delete all records from that table:
WHILE @@FETCH_STATUS = 0
    BEGIN
        SET @sqlCommand = 'DELETE FROM ' + @TableName;
        EXEC (@sqlCommand);
        FETCH NEXT FROM MyCursor INTO @TableName, @RecordCount;
    END;

CLOSE MyCursor;
DEALLOCATE MyCursor;

参考资料：

• sysobjects
• sysindexes
• SQL Server 游标

Answer 9

您可以使用以下内容：

DECLARE db_cursor CURSOR FOR  
SELECT name 
FROM master.dbo.sysdatabases 
WHERE name IN ("TB2","TB1")  -- use these databases

OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @name   


WHILE @@FETCH_STATUS = 0   
BEGIN   

       DELETE FROM @name WHERE PersonID ='2'

       FETCH NEXT FROM db_cursor INTO @name   
END  

Answer 10

CREATE PROCEDURE sp_deleteUserDetails
    @Email varchar(255)
AS
    declare @tempRegId as int
    Delete UserRegistration where Email=@Email  
    set @tempRegId = (select Id from UserRegistration where Email = @Email)
    Delete UserProfile where RegID=@tempRegId

RETURN 0

Answer 11

$qry = "删除 lg. , l. FROM Lessons_game lg RIGHT JOIN 课程 l ON lg.lesson_id = l.id WHERE l.id = ?";

课程是主表，而课程游戏是子表，所以右加入

Answer 12

DELETE TB1, TB2
    FROM customer_details
        LEFT JOIN customer_booking on TB1.cust_id = TB2.fk_cust_id
    WHERE TB1.cust_id = $id

Answer 13

Try this query

DELETE TB1, TB2 FROM TB1 INNER JOIN TB2  
WHERE TB1.PersonID = TB2.PersonID and TB1.PersonID = '2'