mysql学习笔记

mysql -h127.0.0.1 -P 3306 -uroot -p123456 
mysql>create datatabase test; #创建一个test数据库
mysql>use test; #使用test这个数据库
mysql>drop database test; #删除数据库
mysql>show databases; #显示所有的数据库
00x1[表创建实例]------------------------------------------------------------------------------
mysql>create table admin( #创建一个admin表
mysql>id int, #创建字段id，数据类型为int型
mysql>name varchar(255), #创建字段name,数据类型是varchar
mysql>password varchar(255) #创建字段password,数据类型为varchar
mysql>); #更多数据类型可参考:http://www.cnblogs.com/xishaonian/p/6009605.html
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mysql>desc test; #查询表结构
mysql>drop table test; #删除test表
00x1[插入]-------------------------------------------------------------------------------
mysql>insert into admin（‘id‘,‘name‘,‘password‘） value(1,"ergou",","a123456"); #在admin表中插入（id,name,password）值。
00x2[联合查询]---------------------------------------------------------------------------
mysql>select * from admin; #选择admini表。列出所有其数据（鑫号代表全部的意思）
00x3[更新,updata]-----------------------------------------------------------------------------
mysql>uodata user set set id=110 where name=‘ergou‘ and password=‘123456‘； #更新user表，让name等于ergou的和password等于123456的字段ID更新为110
00x4[表明重明名,rename]----------------------------------------------------------------
mysql>rename table auto to price;
00x5[指定删除数据,delect]----------------------------------------------------------------
mysql>delect from book where id="1";
00x6[选定字段查询数据]----------------------------------------------------------------
mysql>select auto,prince from book;
00x7[修改字段查询数据,alert]----------------------------------------------------------------
mysql>alert table admin change ust user varchar(255); 
alter table 表名 change 现有字段名称 修改后字段名称 数据类型
00x8[模糊查询,like]----------------------------------------------------------------
mysql>select bookname,auto,username from book where bookname like "%php%";
00x8[查询结果排序,desc]----------------------------------------------------------------
mysql>select id,name,price from book order by id desc; #倒序排列，升序是asc
00x9[限定查询,limit]----------------------------------------------------------------
mysql>select id,name,price from order by ud desc limit 0,5;
01x0[别名,as]----------------------------------------------------------------
select bookname as ‘图书室‘ , suto as ‘作者‘ from book;
01x0[联合查询，union]----------------------------------------------------------------
mysql>select bookname from book union select bookprice from book;
msyql>select distinct test from hello; #去除hello表下的test列重复的。