WHERE NOT EXISTS在MySQL中的使用及其替代方案。 1. INSERT INTO ... WHERE NOT EXISTS语句的基本概念 INSERT INTO ... WHERE NOT EXISTS语句的目的是在插入新记录之前检查表中是否已经存在具有相同唯一标识的记录。如果记录不存在,则执行插入操作。这种语法在某些数据库系统中是支持的,但在MySQL中并不直接支持。
INSERTINTOtest_table(id,name)VALUES(1,'Alice'),(2,'Bob'),(3,'Charlie'); 1. 2. 3. 4. 4. 使用insert into where not exists 最后,我们可以使用insert into where not exists语句向表中插入数据,前提是要检查条件是否满足。以下是具体的代码: INSERTINTOtest_table(id,name)SELECT*FROM(SELECT4asid...
INSERT INTO test_tab(name,sex,address,lastEndTime,createTime) SELECT'a','b','c',1,1FROM (select1) tmp WHERE NOT EXISTS (Select1FROM test_tabwherename ='0') (2)MySQL(使用系统临时表DUAL) INSERT INTO `test_tab`(`name`,`age`,`addresss`) SELECT'aa',2,'bb'FROM DUAL WHERE NOT E...
INSERTINTO[dbo].[geo_asso_type]([geo_asso_type_id],[bound_asso_type],[updated_date])VALUES(11,'Province to City',GETDATE()WHERENOTEXISTS(SELECT1FROM[dbo].[geo_asso_type]WHERE[geo_asso_type_id]=11) 方案1,前置not exists IFNOTEXISTS(SELECT1FROM[dbo].[geo_asso_type]WHERE[geo_asso_...
INSERTINTOWHERENOTEXISTS ⼀、问题 Postgresql中⽆则插⼊的使⽤⽅法INSERT INTO WHERE NOT EXISTS，⽤法请参考样例。⼆、解决⽅案 （1）PostgresSQL INSERT INTO test_tab(name,sex,address,lastEndTime,createTime)SELECT 'a','b','c',1,1 FROM (select1) tmp WHERE NOT EXISTS (Select ...
Insert Into Where Not Exists insert into with cast datetime Insert into with dynamic SQL and Cursor for variable table/columns according to update list insert millions of records insert more than 1000 rows insert mulitple comma seperated values in a temp table Insert null instead of empty string ...
insert into 和 where not exists 错误的语法 INSERTINTO[dbo].[geo_asso_type]([geo_asso_type_id],[bound_asso_type],[updated_date])VALUES(11,'Province to City',GETDATE()WHERENOTEXISTS(SELECT1FROM[dbo].[geo_asso_type]WHERE[geo_asso_type_id]=11)...
insert的语法只有下面两种。1、insert into 表(字段名1,字段名2...) values(值1,值2...)2、insert into 表1 select 字段 from 表2 where...
你这个语句说白了跟dual 就没有关系 你的目的就是当REC_OVER 没有数据的时候添加一个ORG_ID=1 可以这样写 insert into REC_OVER(ORG_ID)select '1' where (select count（ORG_ID） from REC_OVER ) =0
IF NOT EXISTS (SELECT 1 FROM [dbo].[geo_asso_type] WHERE [geo_asso_type_id] = 11) BEGIN INSERT INTO [dbo].[geo_asso_type] ([geo_asso_type_id] ,[bound_asso_type] ,[updated_date]) VALUES (11 ,'Province to City' ,GETDATE()) END 好文要顶 关注我 收藏该文 微信分享 极客...