sqlserver 判断是否存在,如果存在就update,不存在就insert if not exists(SELECT 1 from pr_equipmentFacility eq inner join pr_equipmentFacilityEx ex on eq.equipmentFacilityID = ex.equipmentFacilityID where eq.equipmentFacilityCode='对应编码') INSERT into pr_equipmentFacilityEx (equipmentFacilityID,brand,e...
在使用redis作为分布式锁之前,先提前了解setnx这个关键字的概念: setnx 是SET if Not eXists(如果不存在,则 SET,存在则返回0)的简写 由于Redis 命令的原子特性,我们可以尝试使用 Redis 的setnx命令,比如setnx phone:13123456789 '',若设置成功,则拿到了该手机号码的锁。后续请求会因为无法拿到该锁而直接失败。在请求...
CREATE TRIGGER tr_T_A ON T_A for INSERT,UPDATE,DELETE 如IF exists (select * from inserted) and not exists (select * from deleted) 则为 INSERT 如IF exists(select * from inserted ) and exists (select * from deleted) 则为 UPDATE 如IF exists (select * from deleted) and not exists (s...
Identifies a node. The nodes identified inExpression1are inserted relative to the node identified byExpression2. This can be an XQuery expression that returns a reference to a node that exists in the currently referenced document. If more than one node is returned, the insert fails. IfExpression...
IF NOT EXISTS(SELECT 1 FROM Table2 WHERE Id=1) INSERT INTO Table2 (Id, name) SELECT Id, name FROM Table1 ELSE INSERT INTO Table2 (Id, name) SELECT Id, name FROM Table1 WHERE Table1.Id<>1 有没有一种更好的方法可以不使用IF - ELSE?我想避免INSERT INTO-SELECT基于某些条件的两个语句...
SQL Server Management Studio (SSMS)教程:创建数据库create database、创建表create table、新增数据insert、查询数据select USE master GO IF NOT EXISTS ( SELECT name FROM sys.databases WHERE name = N'TutorialDB' ) CREATE DATABASE [TutorialDB]
SQL Server 查询: IF (EXISTS (SELECT * FROM failed_logins_ip_address WHERE ip_address = 'xxx')) BEGIN UPDATE failed_logins_ip_address SET attempts_count = attempts_count + 1, attempt_datetime = CURRENT_TIMESTAMP WHERE ip_address = 'xxx' ...
SQL Server上INSERT或UPDATE的解决方案 INSERT和UPDATE的执行状态- MS SQL Server SQL insert、update存储过程 insert with update的SQL insert触发器 SQL Server存储过程: UPDATE with lowest,else INSERT如果已有值 INSERT IF NOT EXISTS ELSE UPDATE in Spark SQL SQL Server : INSERT INTO的帮助 SQL使用Insert/Upd...
1、方法一 IF NOT EXISTS(SELECT * FROM TABLE_NAME WHERE FILED1 = 1 ) THEN INSERT INTO TABLE_NAME VALUES(1 2、将要插入的数据先写入临时表，然后用 INSERT INTO TABLE_NAME SELECT * FROM #TEMP_TABLE A LEFT JOIN TABLE_NAME ON A.FILED1 = B.FIELD1 WHERE B.FILED1 IS NULL ...
sql server 20002005 判断存储过程、触发器、视图是否存在并删除 1、判断是否存在addOneArticle这个存储过程 if Exists(select name from sysobjects where NAME = 'addOneArticle' and...type='P') drop procedure addOneArticle 2、判断是否存在countAr这个触发器 if exists(select * from dbo.sysobjects....