INSERTINTOtable(SELECTid,'hisname'asnameFROMtableWHEREid>=3)ONDUPLICATE KEYUPDATEname=VALUES(name); 这种方法还可以用来批量执行UPDATE操作(因为单条UPDATE语句只能执行一种update操作) 方法二: 创建存储过程 CREATEPROCEDUREname() ifexists(select1from表whereID=@ID)beginUPDATE表SETXX=XXWHEREID=@IDendelsebeg...
ifnotexists(select1from表名where条件='值')--无则插入INSERTINTO表名 ( 键1 , 键2, 键3 )VALUES('值1','值2','值3')else--有则更新UPDATE表名SET键1='值1', 键2='值2'WHERE条件='值'
ifnotexists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1或者ifexists(select1fromtwhereid=1)insertintot(id,update_time)values(1,getdate())elseupdate tsetupdate_time=getdate()whereid=1 1. 2. 3. 4. 5. 6. 7. 8...
SQL 数据库两个表存在更新,不存在插入操作方法 if not exists (select * from A where (select count(1) from B where A.iID = B.IID) <> 0 ) insert into a (iid,objid,sname,SCODE) select bb.iid,bb.objid,bb.sname,bb.scode from B bb else Update a Set objid=dbo.B.objid,sname=dbo....
这种方法还可以用来批量执行UPDATE操作(因为单条UPDATE语句只能执行一种update操作) 方法二: 创建存储过程 CREATEPROCEDUREname()ifexists(select1from表whereID=@ID)beginUPDATE表SETXX=XXWHEREID=@IDendelsebeginINSERT表VALUES(XX...)end 方法三: 使用if not exists或者where not exists ...
to be updated if it already exists and inserted if it does not. If we refer to the Books Online documentation, it gives examples that are similar to: IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue') UPDATE Table1 SET (...) WHERE Column1='SomeValue' ELSE INSERT INTO Table...
先判断是否存在，存在就更新 IF EXISTS(SELECT 1 FROM sys_emp a,inserted b join hr_emp_title c on b.empid = c.empid)BEGIN update c set c.title_code = b.title_code from inserted b join hr_emp_title c on b.empid = c.empid END 不存在就插入 ELSE BEGIN insert into hr_...
to be updated if it already exists and inserted if it does not. If we refer to the Books Online documentation, it gives examples that are similar to: IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue') UPDATE Table1 SET (...) WHERE Column1='SomeValue' ELSE INSERT INTO Table...
UPDATE attempts_count = attempts_count + 1, attempt_datetime = CURRENT_TIMESTAMP 'ip_addess' 列是唯一的,MSSQL 和 MySQL 的表结构相同。 是否有可以在两种数据库类型中执行 IF INSERT ELSE UPDATE 的语法? 是的,我做(PDO)参数绑定,xxx只是为了缩短代码片段。
转SQL当记录不存在时插入insert if not exists 转自:http://blog.sina.com.cn/s/blog_5564eb640100i42t.html 插入(insert)一条记录很简单,但是一些特殊应用,在插入记录前,需要检查这条记录是否已经存在,只有当记录不存在时才执行插入操作,本文介绍的就是这个问题的解决方案。