mysql学习笔记
时间:2021-07-01 10:21:17
帮助过:22人阅读
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
-------------------------------------------------------------------------------------------------
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。
mysql学习笔记
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