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INSERT IGNORE 与 INSERT INTO的区别_MySQL

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Release: 2016-06-01 13:26:31
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insert ignore表示,如果中已经存在相同的记录,则忽略当前新数据;


insert ignore into table(name)  select  name from table2


INSERT INTO有无数据都插入,如果主键则不插入

1.insert语句一次可以插入多组值,每组值用一对圆括号括起来,用逗号分隔,如下:

insert into `news`(title,body,time) values('www.111cn.net','body 1',now()),('title 2','body 2',now());
 
 
下面通过代码说明之间的区别,如下:

create table testtb(
id int not null primary key,
name varchar(50),
age int
);

insert into testtb(id,name,age)values(1,"www.111Cn.net",13);
select * from testtb;
insert ignore into testtb(id,name,age)values(1,"aa",13);
select * from testtb;//仍是1,“bb”,13,因为id是主键,出现主键重复但使用了ignore则错误被忽略
replace into testtb(id,name,age)values(1,"aa",12);
select * from testtb; //数据变为1,"aa",12

更多详细内容请查看:http://www.111cn.net/database/mysql/56643.htm

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