UPDATE A INNER JOIN (SELECT B.B1 as B1,B.B2 as B2,C.C1 as C1 from B LEFT JOIN C on B.B3=C.C3) as t ON A.A3=t.B1 set A.A1=t.B2, A.A2=t.C1; UPDATE tb_bookcase INNER JOIN (SELECT tb_bookinfo.rid as rid,tb_bookinfo.bookname,department.name LEFT JOIN department on tb...
UPDATE A SET (A1, A2, A3) = (SELECT B1, B2, B3 FROM B WHERE A.ID = B.ID) WHERE ID IN (SELECT B.ID FROM B WHERE A.ID = B.ID) 5、SQLServer update与select结合 UPDATE table1 SET column1 = t2.column1, column1 = t2.column2, ... FROM table1 INNER/LEFT/RIGHT JOIN table...
UPDATEusersJOIN(SELECTuser_id,COUNT(*)ASorder_countFROMordersGROUPBYuser_id)oONusers.user_id=o.user_idSETusers.is_vip=CASEWHENorder_count>=3THEN1ELSE0END; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 这条SQL语句的含义是,首先通过一个SELECT语句查询出每个用户的订单数量,然后通过JOIN将查询结果和u...
1:子查询UPDATE A SET A.NAME=(SELECT B.NAME FROM B WHERE B.ID=A.ID),本查询要根据具体情况看看是否变通成如下 代码语言:txt AI代码解释 UPDATE A SET A.NAME=(SELECT B.NAME FROM B WHERE B.ID=A.ID) WHERE A.ID IN (SELECT ID FROM B); 2:利用视图来做 代码语言:txt AI代码解释 UPDATE ...
UPDATEbus_historyT1,(SELECTT2.id,T2.user_accounts,GROUP_CONCAT(T4.user_name)ASuser_namesFROMbus_historyT2JOINmysql.help_topicT3ONT3.help_topic_id<(LENGTH(T1.user_accounts)-LENGTH(REPLACE(T1.user_accounts,',',''))+1)LEFTJOINsys_userT4ONT4.account=SUBSTRING_INDEX(SUBSTRING_INDEX(T1.user_...
实际更新的操作是在要更新的表上进行的,而不是在from子句所形成的新的结果集上进行的 二、Oracle 多表关联更新 Oracle没有update from语法,可以通过两种实现方式: 1、利用子查询: update A SET 字段1=(select 字段表达式 from B WHERE ...), 字段2=(select 字段表达式 from B WHERE ...) ...
如果你的 SQL Server 版本或场景不允许使用 UPDATE ... FROM 语法，你可以考虑以下替代方法：使用 JOIN：UPDATE e SET e.Salary = (SELECT sa.NewSalary FROM SalaryAdjustments sa WHERE e.EmployeeID = sa.EmployeeID)WHERE EXISTS (SELECT 1 FROM SalaryAdjustments sa WHERE e.EmployeeID = sa.EmployeeID)...
SELECT T2.id, T2.user_accounts, GROUP_CONCAT( T4.user_name ) AS user_names FROM bus_history T2 JOIN mysql.help_topic T3 ON T3.help_topic_id < ( LENGTH( T1.user_accounts ) - LENGTH( REPLACE ( T1.user_accounts, ',', '' )) + 1 ) ...
How to UPDATE from SELECT in SQL Server 本文介绍了Inner Join更新数据、MERGE同时更新和插入的使用。 文中短句: alter the contents of a table indirectly:间接地更新表的内容 direct references:直接引用 by using a subset of data:通过使用数据的子集 ...