PostgreSQL
| MySQL
|
服务启动:
1)#service postgresql start
2)#/etc/init.d/postgresql start
3)#su – postgresql
$pg_ctl start
PostgreSQL的进程号:1210、1207、
| 服务启动:
1)#service mysqld start
2)#/etc/init.d/mysqld start
3)#safe_mysqld& MySQL的进程号为1663
|
第一次进入数据库:
#su – postgres
$createdb (建名为postgres的数据库)
$psql
| 第一次进入数据库: #mysql
mysql> (出现这个提示符说明成功)
|
创建用户:(用户Ajian,密码:123)
#su – postgres $psql =#create user ajian with password ‘123’
| 创建用户:(用户Ajian,密码:123)
#grant all privileges on *.* to ajian@"%" identified by "123" (注意:同还可以分配权限,这里是ALL)
|
创建数据库(My): #su – postgres $psql =#create database My with owner = ajian template = template1 encoding=’UNICODE’;
| 创建数据库(My): 1)#mysql Mysql>create database My; 2)#mysqladmin create My
|
查看用户和数据库: #su – postgres $psql =#\l (查看数据库)
=#\du (查看用户)
| 查看用户和数据库: 1)#mysql Mysql>show databases; (看数据库) 2)#mysqlshow
|
新建用户登录: (首先修改配置文件) # vi /var/lib/pgsql/data/pg_hba.conf(在最后加) host all all 127.0.0.1 255.255.255.255 md5 再重启服务:#service postgresql restart 登录:#psql –h 127.0.0.1 –U ajian My Password:
| 新建用户登录: 1)#mysql –u ajian –p (带口令登录) 2)#mysql Mysql>use My; (不带口令登录一般用于本机)
|
创建表(employee): =#create table employee( (#employee_id int primary key, (#name char(8), (#sex char(2));
| 创建表: >create table employee( ->employee_id int primary key, ->name char(8), ->sex char(2));
|
查看表: =#\dt
| 查看表: >show tables;
|
查看表的结构: =#\d employee
| 查看表的结构: >sescribe employee;
|
向表中添加数据: =#insert into employee values -#(‘1’,’zhang’,’F’); -#(‘2’,’chen’,’M’,);
| 向表中添加数据: >insert into employee values ->(‘1’,’zhang’,’F’); ->(‘2’,’chen’,’M’,);
|
查看表的数据: =#select * from emlpoyee
| 查看表的数据: >select * from emlpoyee;
|
创建索引(IN_employee): =#create index IN_employee on employee(name); 查看索引: =#\di 删除索引: =#drop index IN_employee on employee; 重建索引: =#reindex table employee;(重建employee所有的) =#reindex index IN_employee;(重建指定的)
| 创建索引(IN_employee): 1)>create index IN_employee on employee(name); 2)>alter table employee add index IN_employee(name); 查看索引: >show index from employee; 删除索引: 1)>drop index IN_employee on employee; 2)>alter table emlpoyee drop index IN_employee;
|
删除表: =#drop table employee;
| 删除表: >drop table employee;
|
删除数据库:(注意命令前面的标志) 1)=#drop database ajian; 2)$dropdb ajian
| 删除数据库:(注意命令前面的标志) 1)>drop database ajian; 2)#mysqladmin drop ajian
|