Postgresql中无则插入的使用方法INSERT INTO WHERE NOT EXISTS

Posted 2021-03-24 宋兴柱-Sindrol

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 (select 1) tmp WHERE NOT EXISTS (Select 1 FROM test_tab where name = ‘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 EXISTS(SELECT 1 FROM `test_tab` Where name == ‘aa‘)

 

（3）SQLServer

IF NOT EXISTS (SELECT id FROM books WHERE id = 1)  INSERT INTO books (name) SELECT ‘Songxingzhu‘