MySql实用小技巧

Posted 2020-08-22

1. 1：将txt中的数据导入数据库表中，命令：
2. load data local infile ‘D:\\文件名.txt‘ into table 表名 fields terminated by ‘\t‘;

 

2：插入数据后查询显示乱码，解决方案： set character set_results=utf-8;

 

3：多表多外键数据查询

select * from userinfo,usertype,usercert where userinfo.certid=usercert.certid and userinfo.typeid=usertype.typeid limit ?,?;

 

select * from userinfo,usertype,usercert where userinfo.certid=usercert.certid and userinfo.typeid=usertype.typeid and userinfo.userid=140950223 and password=55555 limit ?,?;