时间:2021-07-01 10:21:17 帮助过:9人阅读
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)
=#\c 从一个数据库中转到另一个数据库中,如template1=# \c sales 从template1转到sales
查看用户和数据库:
1)#mysql
Mysql>show databases; (看数据库)
2)#mysqlshow
use dbname;
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: