Home Database Mysql Tutorial MySQL常用命令(持续总结中)

MySQL常用命令(持续总结中)

Jun 07, 2016 pm 03:39 PM
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Windows下MySQL服务的启动与关闭 net stop mysql net start mysql (其中mysql为MySQL服务名称) 显示所有数据库 show databases; 设置当前数据库 use databasename; 显示当前数据库 select database(); 显示当前数据库中的表 show tables; SQL常用命令使用方

Windows下MySQL服务的启动与关闭

net stop mysql

net start mysql

(其中mysql为MySQL服务名称)


显示所有数据库

show databases;

设置当前数据库

use databasename;

显示当前数据库

select database();

显示当前数据库中的表

show tables;


SQL常用命令使用方法:
  
(1) 数据记录筛选:  
sql="select * from 数据表 where 字段名=字段值 order by 字段名 [desc]"    
sql="select * from 数据表 where 字段名 like '%字段值%' order by 字段名 [desc]"   
sql="select top 10 * from 数据表 where 字段名 order by 字段名 [desc]"    
sql="select * from 数据表 where 字段名 in ('值1','值2','值3')"    
sql="select * from 数据表 where 字段名 between 值1 and 值2"

(2) 更新数据记录:  
sql="update 数据表 set 字段名=字段值 where 条件表达式"    
sql="update 数据表 set 字段1=值1,字段2=值2 …… 字段n=值n where 条件表达式"

(3) 删除数据记录:  
sql="delete from 数据表 where 条件表达式"    
sql="delete from 数据表" (将数据表所有记录删除)
 
(4) 添加数据记录:  
sql="insert into 数据表 (字段1,字段2,字段3 …) valuess (值1,值2,值3 …)"    
sql="insert into 目标数据表 select * from 源数据表" (把源数据表的记录添加到目标数据表)

(5) 数据表的建立和删除:  
CREATE TABLE 数据表名称(字段1 类型1(长度),字段2 类型2(长度) …… )  
例:CREATE TABLE tab01(name varchar(50),datetime default now())  
DROP TABLE 数据表名称 (永久性删除一个数据表)

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