OushuDB 基本用法 创建数据库和表

 changlei:build ChangLei$ psql -d postgres
 psql (8.2.15)
 Type "help" for help.

 postgres=＃ create database test;  # 创建数据库test
 CREATE DATABASE

 postgres=＃ \c test  # 连接进入test数据库
 You are now connected to database "test" as user "ChangLei".

 test=＃ create table foo(id int, name varchar);  # 创建表foo
 CREATE TABLE

 test=＃ \d  # 显示当前数据库test中所有表
            List of relations
 Schema | Name | Type  |  Owner   |   Storage
--------+------+-------+----------+-------------
 public | foo  | table | ChangLei | append only
 (1 row)


 test=＃ insert into foo values(1, 'hawq'),(2, 'hdfs');
 INSERT 0 2

 test=＃ select * from foo; # 从表foo中选择数据
  id | name
 ----+------
   1 | hawq
   2 | hdfs
 (2 rows)

 如果想删除表或者数据库的话可以使用drop语句。

 test=＃ drop table foo;
 DROP TABLE

 test=＃ \d
 No relations found.

 test=＃ drop database test;  # 因为现在在test数据库中，所以不能删除
 ERROR:  cannot drop the currently open database

 test=＃ \c postgres  # 首先连接到postgres数据库，然后删除test数据库
 You are now connected to database "postgres" as user "ChangLei".

 postgres=＃ drop database test;
 DROP DATABASE