MySql语句大全（1）增、查、删、改

#查数据
select * from test;  #取所有数据
select * from test limit 0,2;  #取前两条数据 
select * from test email like '%qq%' #查含有qq字符 _表示一个 %表示多个
select * from test order by id asc;#降序desc
select * from test id not in('2','3');#id不含2,3或者去掉not表示含有
select * from test timer between 1 and 10;#数据在1,10之间

#---------------------------表连接知识------------------------------
#等值连接又叫内链接 inner join 只返回两个表中连接字段相等的行
select * from A inner join B on A.id = B.id; #写法1
select * from A,B where A.id = B.id; #写法2
select a.id,a.title from A a inner join B b on a.id=b.id and a.id=1;#写法3 表的临时名称
select a.id as ID,a.title as 标题 from A inner join B on A.id=B.id;#添加as字句

#左连接又叫外连接 left join 返回左表中所有记录和右表中连接字段相等的记录
select * from A left join B on A.id = B.id;

select * from A left join (B,C,D) on (B.i1=A.i1 and C.i2=A.i2 and D.i3 = A.i3);#复杂连接

#右连接又叫外连接 right join 返回右表中所有记录和左表中连接字段相等的记录
select * from A right join B on A.id = B.id;

#完整外部链接 full join 返回左右表中所有数据
select * from A full join B on A.id = B.id;

#交叉连接 没有where字句 返回卡迪尔积
select * from A cross join B;
-------------------------表连接结束------------------------------------------------------------

#显示表结构
describe 
#删除表
drop table test；
#重命名表
alter table test_old rename test_new;
#添加列
alter table test add cn int(4) not null;
#修改列
alter table test change id id1 varchar(10) not null;
#删除列 
alter table test drop cn;
#创建索引
alter table test add index (cn,id);
#删除索引
alter table test drop index cn
#插入数据
insert into test (id,email,ip,state) values(2,'[email protected]','127.0.0.1','0');
#删除数据 
delete from test where id = 1;
#修改数据
update test set id='1',email='[email protected]' where id=1;

实用的insert select语句：

INSERT INTO KM_MEMBER_RELA_FULLCUT (
	SELECT
		a.MB_ID,
		b.MPFC_ID,
		1
	FROM
		KM_MEMBER a,
		KM_MEMBER_PREF_FULLCUT b
	WHERE
		b.MPFC_STATUS = 0
	AND NOT EXISTS (
		SELECT
			1
		FROM
			KM_MEMBER_RELA_FULLCUT
		WHERE
			MB_ID = a.MB_ID
		AND MPFC_ID = b.MPFC_ID
	)
)

 

#登录数据库
mysql -hlocalhost -uroot -p;
#修改密码
mysqladmin -uroot -pold password new;


#显示数据库
show databases;
#显示数据表
show tables;
#选择数据库
use examples;
#创建数据库并设置编码utf-8 多语言
create database `examples` default character set utf8 collate utf8_general_ci;
#删除数据库
drop database examples;
#创建表
create table test(
    id int(10) unsigned zerofill not null auto_increment,
    email varchar(40) not null,
    ip varchar(15) not null,
    state int(10) not null default '-1',
primary key (id)
)engine=InnoDB;

 

转自：https://blog.csdn.net/suifenglie/article/details/74981817