今天介紹的是關于Mysql數據庫一些操作的基礎命令
用戶與權限
創建用戶
mysql>create user test identified by 'BaC321@#'; 修改密碼
5.5版本及以前的命令
mysql>set password for test=passowrd('!1A@2#3'); 5.6及以上命令
mysql>update mysql.user set authentication_string=password('A1b2c3#!@') where user='test'; 創建用戶并授權
mysql>grant select,insert,update on student.* to test@localhost identified by 'A1b2c3#!@'; 查看授權
mysql> show grants for test@localhost; 
移除權限
mysql> revoke insert,update on student.* from test@localhost; 建庫與表
創建庫
mysql> create database student; mysql> show databases; 
創建表
mysql> use student; mysql> create table T1 (name varchar(10) not null,sex varchar(10) not null); 通過現有的表創建新表
mysql> create table T2 as select * from T1; 插入數據
mysql> insert into T1 values('zhang','man');
Query OK, 1 row affected (0.03 sec)
mysql> insert into T1 values('li','man');
Query OK, 1 row affected (0.03 sec)
mysql> insert into T1 values('wang','man');
Query OK, 1 row affected (0.02 sec)
mysql> insert into T1 values('zhao','women');
Query OK, 1 row affected (0.05 sec)
#需要注意的是如果列超過兩列，就需要指定列字段名如下
mysql> insert into T1(name,sex) values('gege','man'); 查詢數據
查詢數據
mysql> select user,host from mysql.user;
#查看用戶
mysql> select * from T1 where name like '%an%';
mysql> select * from T1 where age like '2%'; 匹配查詢
mysql> select * from T1 order by name,age; 查詢排序
mysql> select count(*) as toaolcount from T1; mysql> select sum(age) as sumvalue from T1; mysql> select avg(age) as avgvalue from T1; mysql> select max(age) from T1; 查詢值
mysql> select score from T1 where score <91; mysql> select score from T1 where score >=91; mysql> select * from T1 where score in (96,100); 條件查詢
mysql> select * from T2; mysql> select * from T1; 
增刪更新
增加與刪除列
mysql> alter table T1 add age int(4) not null;
mysql> alter table T1 drop age 更新表里的數據
mysql> update T1 set age=25 where name='zhang';
mysql> update T1 set age=23 where name='li'; 刪除數據
mysql> delete from T1 where age='22'; 建索引與刪除
mysql> create index indexT1 on T1(name(10));
mysql> drop index indexT1 on T1; 主鍵與視圖
創建主鍵
mysql> alter table T1 add primary key(name);
mysql> desc T1; 
創建與刪除視圖
mysql> create view t1view as select name from T1;
mysql> select * from t1view; 
mysql> drop view t1view;
mysql> select * from t1view;
ERROR 1146 (42S02): Table 'student.t1view' doesn't exist
#提示此視圖不存在 
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