MYSQLデータベースベース
2823 ワード
MYSQL
# [ ]
mysql -hlocalhost -uroot -p;
#
mysqladmin -uroot -pold password new;
#
show databases;
#
show tables;
#show
show create database db_name;#
show create table tb_name\G;#
show CHARACTER SET LIKE 'latin%';#SHOW CHARACTER SET 。
SHOW ENGINES\G; , , 。
"\G" ;
#
use examples;
:window
utf8,window gbk, , set names gbk;
# utf-8
create database `examples` default character set utf8 collate utf8_general_ci;
#
drop database examples;
:Mysql , / ,database .
phpMyAdmin ? , , .
#
: show tables;
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;
:
1. not null default ''/default 0;
: null 。
2.null 。
: ,null , is null is not null 。
null;
select null=null; null
select null!=null; null
, 。
# : drop table stu;
#
describe tb_name
show [full]columns from db_name.tb_name;
#
truncate tb_name;# , ,
delete from tb_name where expir.. #
#
alter table test_old rename test_new;
#
alter table test add birth date not null default '0000-00-00';
alter table test add uname varchar(30) not null default '' after id;# id
alter table m1 add pid int not null default 0 first; # first
#
--modify , :[alter table modify ]
alter table test modify gender char(4) not null default '';
--change , :[alter table change ]
alter table test change id uid varchar(10) not null;
#
alter table test drop pid;
# MySQL
MySQL , old_table new_table 。
1. , 。
CREATE TABLE new_table LIKE old_table
2. SELECT ,new_table 、 。
CREATE TABLE new_table AS
(
SELECT *
FROM old_table
)
3.
CREATE TABLE new_table LIKE old_table;
INSERT INTO new_table SELECT * FROM old_table;
4.
CREATE TABLE new_table AS
(
SELECT field1, field2 FROM old_table
)
5.
CREATE TABLE new_table AS
(
SELECT * FROM old_table WHERE field1 = test'
)
:
mysql>tee D:test.sql tee sql
mysql
mysql>use dbtest;
mysql>set names utf8;
mysql>set autocommit=0;
mysql>source D:/www/sql/back.sql;
source , test.sql ,
source d:/a.sql;
source d:/b.sql;
mysql>source D:/test.sql;
source sql