IF NOT EXISTS是一个非常有用的功能,它允许你在执行创建或插入操作之前,先检查目标对象(如表或数据记录)是否已存在,从而避免重复操作或错误。下面我将详细解释IF NOT EXISTS的用法,并提供相关示例。 1. 解释SQLite中"IF NOT EXISTS"的用法 创建表时:CREATE TABLE IF NOT EXISTS 语句用于在数据库中创建一
wherenotexists(select*fromErrorConfigwhereType='RetryWaitSeconds') 因为SQLite 中不支持SP 补充:sqlite3中NOT IN 不好用的问题 在用sqlite3熟悉SQL的时候遇到了一个百思不得其解的问题,也没有在google上找到答案。虽然最后用“迂回”的方式碰巧解决了这个问题,但暂时不清楚原理是什么,目前精力有限,所以暂时记录下...
sqlite语法: 代码如下: insert into [t_Table] ([fName]) select '张三' where not exists (SELECT 1 FROM [t_Table] where [fName] = '张三');
mssql和sqlite中关于ifnotexists的写法 在sql语名中，if not exists 即如果不存在，if exists 即如果存在。下⾯学习下⼆者的⽤法。复制代码代码如下:if not exists（select * from sys.databases where name = 'database_name'）复制代码代码如下:if not exists (select * from sysobjects where id = ...
sqlite if not exists应用实例 INSERT or replace INTO [main].[RecordInfo]([WorkID],[bArtificialAttendance],[fThreshold],[Attendance_Time],[PicPath])select'012','1','60.00','2015-11-25 11:59:08.000','123'wherenot exists (SELECT [Attendance_Time] FROM [main].[RecordInfo] WHERE [WorkID...
1 insert into t(sPath) SELECT 'abc' WHERE NOT exists (SELECT * FROM t where sPath = 'abc')
问SQLite 'IF NOT EXISTS‘语法错误ENtableA |column1 | column1 |column3 | --- tableb |column...
SQLite实现ifnotexist类似功能的操作 需要实现：if not exists(select * from ErrorConfig where Type='RetryWaitSeconds')begin insert into ErrorConfig(Type,Value1)values('RetryWaitSeconds','3')end 只能⽤：insert into ErrorConfig(Type,Value1)select 'RetryWaitSeconds','3'where not exists(select * from...
How to do IF NOT EXISTS in SQLite http://stackoverflow.com/questions/531035/how-to-do-if-not-exists-in-sqlite How about this? INSERT OR IGNORE INTO EVENTTYPE (EventTypeName) VALUES 'ANI Received' 1. (Untested as I don't have SQLite... howeverthis linkis quite descriptive.)...
http://stackoverflow.com/questions/531035/how-to-do-if-not-exists-in-sqlite How about this? INSERTORIGNOREINTOEVENTTYPE (EventTypeName)VALUES'ANI Received' (Untested as I don't have SQLite... howeverthis linkis quite descriptive.) Additionally, this should also work: ...