mysql 惯用 sql 语句（一）

truncate table fke_message;

alter table fke_message auto_increment = 10001;

DROP TABLE IF EXISTS `fke_message`;CREATE TABLE `fke_message` (  `id` int(10) NOT NULL AUTO_INCREMENT,  `username` varchar(40) NOT NULL DEFAULT '' COMMENT '用户名',  `tel` varchar(20) NOT NULL DEFAULT '' COMMENT '电话号码',  `email` varchar(40) NOT NULL DEFAULT '' COMMENT '电子邮箱',  `msginfo` varchar(255) NOT NULL DEFAULT '' COMMENT '留言信息',  `createdate` int(11) NOT NULL DEFAULT '0' COMMENT '时间戳',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;

1. 统计用户量

select count(distinct id) from fke_member

alter table e_down add soft_version1 varchar(50) NOT NULL default '' ;

alter table address modify column city varchar(50) NOT NULL default '';

alter table member add index id_index(id);

create database test default CHARACTER SET utf8 COLLATE utf8_general_ci;