mysql建库建表,导出表结构
//建库: create database db_name character set =utf8; /*建立库db_name,默认字符集为utf8*/ //建表: create table tb_1 (id int auto_increment primary key, remark varchar(20)) engine=innodb default character set=utf8 auto_increment =100; /*建立表tb_1,存储引擎为innodb,默认字符集为utf8,自增列开始值为100*/ create table tb_2 (id2 int auto_increment primary key, remark varchar(20)) engine=innodb default character set=utf8 auto_increment =100; //删表 DROP TABLE IF EXISTS `A`; //删库 drop database 库1 //内联接: select * from t1 inner join t2 where t1.id=t2.id2; //左联接: select * from t1 left join t2 on t1.id=t2.id2; //右联接: select * from t1 right join t2 on t1.id=t2.id2; //全联接: select * from t1,t2
另外导出数据库表结构:
mysqldump -uroot -p ugood_newspaper_db merchant_orders>aaa.sql;
ugood_newspaper_db数据库名,merchant_orders表名,aaa是导出文件名