mysql sqlite3 postgresql 简明操作

 安装

mysql

$ sudo apt-get install mysql-server

sqlite3

$ sudo apt-get install sqlite3

postgresql

$ sudo apt-get install postgresql

用户

mysql添加/删除用户

添加：
mysql> CREATE USER 'user1'@'localhost' IDENTIFIED BY 'pass1';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'finley'@'localhost'WITH GRANT OPTION;
删除：
mysql> DROP USER 'user1'@'localhost';

postgresql

$ sudo adduser user1 #先在系统中添加一个用户

$ sudo su - postgres
postgres@debian:~$ psql
postgres=# CREATE USER user1 WITH PASSWORD 'password';

删除用户：
postgres=# DROP user user1;

认证失败见 http://www.cnblogs.com/ibgo/p/5961849.html 

登录/登出

msql

$ mysql -u jack -p
mysql> q

sqlite

$ sqlite3 
sqlite> .q

postgresql

$ psql -U user1 -d exampledb
exampledb=> q

 数据库

mysql  添加/删除数据库

mysql> CREATE DATABASE abc;
mysql> DROP DATABASE abc;

sqlite 添加/删除数据库

$ sqlite3 abc.db  
$ rm abc.db

postgresql添加/删除数据库

postgres=# CREATE DATABASE exampledb OWNER user1;
postgres=# GRANT ALL PRIVILEGES ON DATABASE exampledb to user1;
只有给user1用户赋予创建数据库的权限后他才能创建数据库！这里user1用户只是对exampledb数据库有操作权限。

postgres=# CREATE DATABASE db1;
postgres=# DROP DATABASE db1;

数据表

mysql添加/删除数据表

mysql> CREATE TABLE tb1(id int auto_increment,name varchar(10),primary key(id));
mysql> DROP TABLE tb1;

sqlite添加/删除数据表

sqlite> CREATE TABLE users(id integer primary key autoincrement,name text,age int);
sqlite> DROP TABLE users;

postgresql

exampledb=> CREATE TABLE users(id serial,name VARCHAR(20), signup_date DATE);
exampledb=> DROP TABLE users;

	sqlite3	mysql	postgresql
insall	$ sudo apt-get install sqlite3	$ sudo apt-get install mysql-server	$ sudo apt-get install postgresql
login	$ sqlite3	$ mysql -u jack -p
logout	sqlite> .q	mysql> q
add user		mysql> CREATE USER 'user1'@'localhost' IDENTIFIED BY 'pass1'; mysql> GRANT ALL PRIVILEGES ON . TO 'finley'@'localhost'WITH GRANT OPTION;
delete user		mysql> DROP USER 'user1'@'localhost';
create database	$ sqlite3 abc.db	mysql> CREATE DATABASE abc;
delete database	$ rm abc.db	mysql> DROP DATABASE abc;
create table	sqlite> CREATE TABLE users(id integer primary key autoincrement,name text,age int);	mysql> CREATE TABLE tb1(id int autoincrement,name varchar(10),primary key(id));
delete table	sqlite> DROP TABLE tb1;	mysql> DROP TABLE tb1;

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