MySql 和 PostGres 对照表 

初始化数据库 

$prefix/bin/mysql_install_db --ldata=XXX--user=mysql 

mkdir XXX; $prefix/bin/initdb [-D $prefix/wdb] -WXXX 

启动|停止 数据库服务器 

$prefix/share/mysql/mysql.server start|stop 

pg_ctl -w -D XXX -l $prefix/wdb/xpg_logstart|stop 

进入命令行 

# mysql 

# psql postgres 

添加用户 

mysql$ grant all privileges on *.* to zhangsan@"%" identified by"123" 

postgres=# create user ajian with password‘123’ 

以某用户身份进入命令行 

# mysql -u zhangsan -p 

# psql -h 127.0.0.1 -U zhangsan YYY 

创建数据库 

mysql$ create database YYY; 

postgres=# create database YYY 

显示数据库 

mysql$ show databases; 

postgres=# \l 

创建表 

mysql$ Create table employee(employee_id int primary key, namechar(8), sex char(2)); 

postgres=# create table employee(employee_id int primary key, namechar(8), sex char(2)); 

显示数据表 

mysql$ show tables; 

postgres=# \dt 

显示表结构 

mysql$ describe employee; 

postgres=# \d employee 

插入记录 

mysql$ insert into employeevalues('1','zhang','F'); 

postgres=# insert into employeevalues('1','zhang','F'); 

显示记录 

mysql$  select * fromemployee; 

postgres=#  select * fromemployee; 

删除记录 

mysql$  delete from employee whereemployee_id='3'; 

postgres=# delete from employee whereemployee_id='3'; 

删除表 

mysql$  drop tableemployee; 

postgres=#  drop tableemployee; 

删除数据库 

mysql$  drop database YYY; 

postgres=#  drop databaseYYY; 

切换数据库 

mysql$ use YYY; 

postgres=# \c YYY