SELECT*FROMchild_tableWHEREparent_id=1;-- 根据查询结果决定是否删除关联数据行DELETEFROMparent_tableWHEREid=1; 1. 2. 3. 4. 5. 序列图 下面是一个序列图,展示了Delete操作中涉及到的相关表之间的关系和操作流程: DatabaseServerClientDatabaseServerClient发起De
DELETE语句用于删除表中的记录。 TRUNCATE TABLE可以清空表,也就是删除所有行。 删除表中的指定数据 DELETE FROM user WHERE username = 'robot'; 1. 2. 清空表中的数据 TRUNCATE TABLE user; 1. 查询数据 SELECT语句用于从数据库中查询数据。 DISTINCT用于返回唯一不同的值。它作用于所有列,也就是说所有列的...
在Delete SQL语句中使用Join,可以通过以下方式实现: DELETE t1 FROM table1 t1 JOIN table2 t2 ON t1.column_name = t2.column_name WHERE condition; 复制代码 在上面的语句中,table1是要删除数据的表,table2是需要连接的表。通过JOIN关键字指定连接条件,然后在WHERE子句中添加要删除的数据的条件。 请注意,使...
Fabric 中 SQL Server、Azure SQL Database 和 SQL Database 的語法: syntaxsql 複製 [ FROM { <table_source> } [ , ...n ] ] <table_source> ::= { table_or_view_name [ FOR SYSTEM_TIME <system_time> ] [ [ AS ] table_alias ] [ <tablesample_clause> ] [ WITH ( < table_hint ...
其次，sql server的话，得分开写，不能写到一起，你可以写一个tranction,例如 begin transaction;declare @deletedIds table ( id int );DELETE Works output deleted.id into @deletedIds FROM c_works Works JOIN c_works_attach Works_attach ON Works_attach.wid=Works.id JOIN c_works_image ...
-- Syntax for Azure Synapse Analytics and Microsoft Fabric [ WITH <common_table_expression> [ ,...n ] ] DELETE [database_name . [ schema ] . | schema. ] table_name FROM [database_name . [ schema ] . | schema. ] table_name JOIN {<join_table_source>}[ ,...n ] ON <join_...
Write SQL query to remove patient bill information who is suffering with cancer disease DELETE t1 FROM bill as t1 INNER JOIN patient AS t2 ON bill.patient_id = t2.patient_id WHERE (t2.disease = 'cancer'); When we execute above query one record will be deleted from bill table as there...
SQL Server不支持一次删除多张表中的数据 https://stackoverflow.com/questions/783726/how-do-i-delete-from-multiple-tables-using-inner-join-in-sql-server You can take advantage of the "deleted" pseudo table in this example. Something like: ...
在SQL Server中,UPDATE和DELETE语句是可以结合INNER/LEFT/RIGHT/FULL JOIN来使用的。 我们首先在数据库中新建两张表: [T_A] CREATETABLE[dbo].[T_A]([ID][int]NOTNULL,[Name][nvarchar](50)NULL,[Age][int]NULL,CONSTRAINT[PK_T_A]PRIMARYKEYCLUSTERED([ID]ASC)WITH(PAD_INDEX=OFF, STATISTICS_NORECOMPU...
[Sql server 2012] Change from vertical to horizontal table as dynamic @@FETCH_STATUS in nested loops @@ServerName returns wrong value in SQL SERVER 2008 ##TempTable and INSERT-SELECT FROM an existing Table with an IDENTITY column %rowtype equivalent in SQL server ++ operator in TSQL - bug ...