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mysql常用语句_MySQL

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2016-06-01 13:45:55920browse

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1.复制表结构和数据,但是不复制索引和外键:
create table a select * from b;
2.复制表结构和索引和外键,不复制数据:
create table a like b;
3.只复制数据:
insert into a select * from b;
4.移动表到另一个库
rename table a.t to b.t;
5.删除重复记录
--新建一个临时表
create table tmp as select * from youtable group by name ;
 
--删除原来的表
 
drop table youtable ;
 
--重命名表
 
alter table tmp rename youtable;
--新建一个临时表
create table tmp like youtable;
 
--取出不重复的数据
 
insert into select * from youtable group by name;
 
--清空原来的表
 
truncate youtable;
 
--插入原来的表
 
insert into youtable select * from tmp;
 
--重命名表
 
drop table tmp;
6.重命名数据库
到/var/lib/mysql/
修改对应数据库的文件夹名即可
7.时间格式
SELECT FROM_UNIXTIME( 1249488000,'%Y-%m-%d %H:%i:%s') ;
SELECT DATE_FORMAT('1997-10-04 22:23:00', '%Y-%m-%d %H:%i:%s');
 
SELECT UNIX_TIMESTAMP('2009-08-06') ;
8.mysql日志
--查看日志
show binary logs;
 
show master logs;
 
--清除日志
 
PURGE MASTER LOGS TO 'mysql-bin.000035';
 
--手动删除10天前的mysql binlog日志
 
PURGE MASTER LOGS BEFORE DATE_SUB(CURRENT_DATE, INTERVAL 10 DAY);
9.获得更新记录数
select ROW_COUNT();
10.获得找到的记录数
select FOUND_ROWS();
11.获得插入的id
select LAST_INSERT_ID();
12.创建特殊表名
SET sql_mode='ANSI_QUOTES';
create table "a-b" (a int);
13.插入不重复数据
insert into node (name) select 'a' where no exists(select id from node where id=2 and name='a')
14.uuid
select replace(uuid(), '-', '');
15.添加一个远程用户,名为username密码为password
GRANT ALL PRIVILEGES ON *.* TO username@"%" IDENTIFIED BY 'password' WITH GRANT OPTION;
16.从文件导入数据
LOAD DATA INFILE '/tmp/result100.txt' INTO TABLE analy_ip_file2 FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '/n';
17.添加主键
alter table userconfig add id int(4) auto_increment primary key;
18.查看mysql参数
show variables like '%max%';
end
 
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