create database new_dbname;--新建数据库
drop database old_dbnane; --删除数据库
show databases;--显示数据库
use databasename;--使用数据库
select database();--查看已选择的数据库
show tables;--显示当前库的所有表
create table tablename(fieldname1 fieldtype1,fieldname2 fieldtype2,..)[ENGINE=engine_name];--创建表
drop table tablename; --删除表
create table tablename select statement;--通过子查询创建表
desc tablename;--查看表结构
show create table tablename;--查看建表语句
alter table tablename add new_fielname new_fieldtype;--新增列
alter table tablename add new_fielname new_fieldtype after 列名1;--在列名1后新增列
alter table tablename modify fieldname new_fieldtype;--修改列
alter table tablename drop fieldname;--删除列
alter table tablename_old rename tablename_new;--表重命名
insert into tablename(fieldname1,fieldname2,fieldnamen) valuse(value1,value2,valuen);--增
delete from tablename [where fieldname=value];--删
update tablename set fieldname1=new_value where filename2=value;--改
select * from tablename [where filename=value];--查
truncate table tablename;--清空表中所有数据，DDL语句
show engines;--查看mysql现在已提供的存储引擎:
show variables like '%storage_engine%';--查看mysql当前默认的存储引擎
show create table tablename;--查看某张表用的存储引擎（结果的"ENGINE="部分）
alter table tablename ENGINE=InnoDB--修改引擎
create table tablename(fieldname1 fieldtype1,fieldname2 fieldtype2,..) ENGINE=engine_name;--创建表时设置存储引擎
---------------------
作者：上杉绘梨衣-
来源：CSDN
原文：https://blog.csdn.net/wjlwangluo/article/details/78165588
版权声明：本文为博主原创文章，转载请附上博文链接！
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/royjj/article/details/49822373
mysql> CREATE TABLE `employees1` (
-> `id` int(11) NOT NULL,
-> `fname` varchar(30) DEFAULT NULL,
-> `lname` varchar(30) DEFAULT NULL,
-> `hired` date NOT NULL DEFAULT '1970-01-01',
-> `separated` date NOT NULL DEFAULT '9999-12-31',
-> `job_code` int(11) NOT NULL,
-> `store_id` int(11) DEFAULT NULL
-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1
-> /*!50100 PARTITION BY RANGE (store_id)
-> (PARTITION p0 VALUES LESS THAN (6) ENGINE = InnoDB,
-> PARTITION p1 VALUES LESS THAN (11) ENGINE = InnoDB,
-> PARTITION p2 VALUES LESS THAN (16) ENGINE = InnoDB,
-> PARTITION p3 VALUES LESS THAN (21) ENGINE = InnoDB) */;
Query OK, 0 rows affected (0.59 sec)
mysql> show create table employees1;
+------------
| Table | Create Table
------------------------------------------------------------------------------------------------------------------+
| employees1 | CREATE TABLE `employees1` (
`id` int(11) NOT NULL,
`fname` varchar(30) DEFAULT NULL,
`lname` varchar(30) DEFAULT NULL,
`hired` date NOT NULL DEFAULT '1970-01-01',
`separated` date NOT NULL DEFAULT '9999-12-31',
`job_code` int(11) NOT NULL,
`store_id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (store_id)
(PARTITION p0 VALUES LESS THAN (6) ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN (11) ENGINE = InnoDB,
PARTITION p2 VALUES LESS THAN (16) ENGINE = InnoDB,
PARTITION p3 VALUES LESS THAN (21) ENGINE = InnoDB) */ |
+------------
1 row in set (0.11 sec)
mysql> alter table employees1 drop partition p0,p3;
Query OK, 0 rows affected (0.14 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table employees1;
+--------------------------------------------------------------------------------------------+
| Table | Create Table
------------------------------------------------------------------------------------------+
| employees1 | CREATE TABLE `employees1` (
`id` int(11) NOT NULL,
`fname` varchar(30) DEFAULT NULL,
`lname` varchar(30) DEFAULT NULL,
`hired` date NOT NULL DEFAULT '1970-01-01',
`separated` date NOT NULL DEFAULT '9999-12-31',
`job_code` int(11) NOT NULL,
`store_id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (store_id)
(PARTITION p1 VALUES LESS THAN (11) ENGINE = InnoDB,
PARTITION p2 VALUES LESS THAN (16) ENGINE = InnoDB) */ |
+-----------------------------------+
1 row in set (0.02 sec)
---------------------
作者：lixora
来源：CSDN
原文：https://blog.csdn.net/lixora/article/details/49822373
版权声明：本文为博主原创文章，转载请附上博文链接！