1.首先创建students表CREATE TABLE students( id integer NOT NULL, name character varying(255), sex character varying(255), class character varying(255), "like" character varying(255), school character varying(255), phone character v..
PostgreSQL 9.5-使用函数或with实现create table test(id int primary key, info text, crt_time timestamp);with upsert as (update test set info='test',crt_time=now() where id=1 returning *) insert into test select 1,'test',now() where ..
REPLACE语法REPLACE(String,from_str,to_str)即:将String中所有出现的from_str替换为to_str,这里的from_str不支持正则匹配。操作实例测试表数据如下:mysql> select * from `LOL`;+----+----------------+--------------+-------+| id | hero_tit..
[mysql]replace的用法(替换某字段部分内容)[mysql]replace的用法1.replace into replace into table (id,name) values('1','aa'),('2','bb') 此语句的作用是向表table中插入两条记录。如果主键id为1或2不存在就相当于 insert into table (id,name..
本文实例讲述了mysql 中 replace into 与 insert into on duplicate key update 的用法和不同点。分享给大家供大家参考,具体如下:replace into和insert into on duplicate key update都是为了解决我们平时的一个问题就是如果数据库中存在了该条记..