1.下载表
mysql -h 127.0.0.1 -P 3306 -u root -p123456 data_yjx_normal -e "select * from task;" > task.txt
2.设置sql常用启动脚本
[jingsia@localhost ~]$ cat bin/sql
mysql -h 127.0.0.1 -P 3306 -u jingsia -p123456
3.查询系统时间方法
mysql> select current_date as Systemtime;
+------------+
| Systemtime |
+------------+
| 2017-01-22 |
+------------+
mysql> select now();
+---------------------+
| now() |
+---------------------+
| 2017-01-22 14:37:35 |
+---------------------+
mysql> select sysdate();
+---------------------+
| sysdate() |
+---------------------+
| 2017-01-22 14:38:44 |
+---------------------+
4.设置时间 东八区
set time_zone = '+8:00'
5.查看时区
mysql> show variables like "%time_zone%";
+------------------+--------+
| Variable_name | Value |
+------------------+--------+
| system_time_zone | PST |
| time_zone | +08:00 |
+------------------+--------+
vim /etc/my.cnf
在mysqld段里添加如下字段
default-time_zoen = '+8:00'
6.输出表具体信息
show full fields from 表名称;
7.创建表
DROP TABLE IF EXISTS `gov_exploit`;
CREATE TABLE `gov_exploit`(
`id` tinyint(3) unsigned NOT NULL DEFAULT '0',
`type` tinyint(3) unsigned NOT NULL DEFAULT '0',
`openLevel` tinyint(3) unsigned NOT NULL DEFAULT '0',
`growLevel` varchar(255) NOT NULL,
`bonus` varchar(255) NOT NULL,
`cost` varchar(255) NOT NULL,
PRIMARY KEY(`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
8.增删改查 表
alter TABLE `equip` add column `hp` int(10) NOT NULL DEFAULT '0' after `id`;
alter table `equip` change column `konck` `knock` int(10);
alter table `equip` drop KEY id;
alter table `equip` drop column hp;
select * from `equip`;
查看列:desc 表名;
修改表名:alter table t_book rename to bbb;
添加列:alter table 表名 add column 列名 varchar(30);
删除列:alter table 表名 drop column 列名;
修改列名: alter table bbb change nnnnn hh int;
修改列属性:alter table t_book modify name varchar(22);
9.时间戳函数unix_timestamp和from_unixtime
->将时间转换为时间戳,没参数则当前时间
mysql> select unix_timestamp();
+------------------+
| unix_timestamp() |
+------------------+
| 1485070742 |
+------------------+
->将时间戳转化为date
mysql> select from_unixtime(1484323200);
+---------------------------+
| from_unixtime(1484323200) |
+---------------------------+
| 2017-01-14 00:00:00 |
+---------------------------+