常规索引:
在常用查询的字段上使用常规索引
创建表时一块创建索引
create table if not exists carshop(id int not null auto_increment, uid int not null, gid int not null, primay key(id), index cuid(uid), key cgid(gid));
create table if not exists carshop(id int not null auto_increment, uid int not null, gid int not null, primary key(id), index carindex(uid, gid));
单独创建索引
create index carindex on carshop(uid, gid);
删除索引
drop index carindex on carshop;
全文索引:只能用在char varchar text字符类型