PostgreSql初探(2)-创建数据库
2015-06-19 11:42
423 查看
1.创建数据库
createdb
[postgres@gc1 ~] createdb mydb
createdb 是一个 SQL 命令 CREATE DATABASE的封装,和在psql里通过create database mydb效果是一样的
具体可以参见文档http://www.postgres.cn/docs/9.3/app-createdb.html
2.访问数据库
psql,就像sqlplus一样
[postgres@gc1 ~] plsq mydb
psql (9.4.4)
Type “help” for help.
mydb=#
最后一行也可能是mydb=>
‘#’意味着你是数据库超级用户
不加‘;’的话不会像oracle与mysql一样等待你输入‘;’
psql程序有一些不属于SQL命令的内部命令,他们以‘\’开头
sql命令的帮助信息
psql命令的帮助信息
mydb-# \q
[postgres@gc1 ~]$
\q就是退出了,也不会向mysql一样说个bye啊:-(
关于plsql的详细内容可以看文档http://www.postgres.cn/docs/9.3/app-psql.html
挑几个有用的说说
testdb=>\set PROMPT1 ‘%n@%m %~%R%# ‘
peter@localhost testdb=>
不用说也能懂了吧
You can display tables in different ways by using the \pset command:
通过\pset改变输出格式
Alternatively, use the short commands:
createdb
[postgres@gc1 ~] createdb mydb
createdb 是一个 SQL 命令 CREATE DATABASE的封装,和在psql里通过create database mydb效果是一样的
具体可以参见文档http://www.postgres.cn/docs/9.3/app-createdb.html
2.访问数据库
psql,就像sqlplus一样
[postgres@gc1 ~] plsq mydb
psql (9.4.4)
Type “help” for help.
mydb=#
最后一行也可能是mydb=>
‘#’意味着你是数据库超级用户
[code]mydb=# select version(); version --------------------------------------------------------------------------------------------------------------- PostgreSQL 9.4.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-48), 64-bit (1 row)
[code]mydb=# select version()
不加‘;’的话不会像oracle与mysql一样等待你输入‘;’
psql程序有一些不属于SQL命令的内部命令,他们以‘\’开头
[code]mydb=# help You are using psql, the command-line interface to PostgreSQL. Type: \copyright for distribution terms \h for help with SQL commands \? for help with psql commands \g or terminate with semicolon to execute query \q to quit
[code]mydb-# \h Available help: ABORT CREATE FOREIGN DATA WRAPPER DROP SEQUENCE ALTER AGGREGATE CREATE FOREIGN TABLE DROP SERVER ALTER COLLATION CREATE FUNCTION DROP TABLE ALTER CONVERSION CREATE GROUP DROP TABLESPACE ALTER DATABASE CREATE INDEX DROP TEXT SEARCH CONFIGURATION ALTER DEFAULT PRIVILEGES CREATE LANGUAGE DROP TEXT SEARCH DICTIONARY ALTER DOMAIN CREATE MATERIALIZED VIEW DROP TEXT SEARCH PARSER ALTER EVENT TRIGGER CREATE OPERATOR DROP TEXT SEARCH TEMPLATE ALTER EXTENSION CREATE OPERATOR CLASS DROP TRIGGER ALTER FOREIGN DATA WRAPPER CREATE OPERATOR FAMILY DROP TYPE ALTER FOREIGN TABLE CREATE ROLE DROP USER ALTER FUNCTION CREATE RULE DROP USER MAPPING ALTER GROUP CREATE SCHEMA DROP VIEW ALTER INDEX CREATE SEQUENCE END ALTER LANGUAGE CREATE SERVER EXECUTE ALTER LARGE OBJECT CREATE TABLE EXPLAIN ALTER MATERIALIZED VIEW CREATE TABLE AS FETCH ALTER OPERATOR CREATE TABLESPACE GRANT --More--
sql命令的帮助信息
[code]mydb=# \? General \copyright show PostgreSQL usage and distribution terms \g [FILE] or ; execute query (and send results to file or |pipe) \gset [PREFIX] execute query and store results in psql variables \h [NAME] help on syntax of SQL commands, * for all commands \q quit psql \watch [SEC] execute query every SEC seconds Query Buffer \e [FILE] [LINE] edit the query buffer (or file) with external editor \ef [FUNCNAME [LINE]] edit function definition with external editor \p show the contents of the query buffer \r reset (clear) the query buffer \s [FILE] display history or save it to file \w FILE write query buffer to file Input/Output \copy ... perform SQL COPY with data stream to the client host \echo [STRING] write string to standard output --More--
psql命令的帮助信息
mydb-# \q
[postgres@gc1 ~]$
\q就是退出了,也不会向mysql一样说个bye啊:-(
关于plsql的详细内容可以看文档http://www.postgres.cn/docs/9.3/app-psql.html
挑几个有用的说说
testdb=>\set PROMPT1 ‘%n@%m %~%R%# ‘
peter@localhost testdb=>
不用说也能懂了吧
You can display tables in different ways by using the \pset command:
[code]peter@localhost testdb=>\pset border 2Border style is 2. peter@localhost testdb=>SELECT * FROM my_table;+-------+--------+ | first | second | +-------+--------+ | 1 | one | | 2 | two | | 3 | three | | 4 | four | +-------+--------+ (4 rows)
[code]peter@localhost testdb=>\pset border 0Border style is 0. peter@localhost testdb=>SELECT * FROM my_table;first second ----- ------ 1 one 2 two 3 three 4 four (4 rows)
[code]peter@localhost testdb=>\pset border 1Border style is 1. peter@localhost testdb=>\pset format unalignedOutput format is unaligned. peter@localhost testdb=>\pset fieldsep ","Field separator is ",". peter@localhost testdb=>\pset tuples_onlyShowing only tuples. peter@localhost testdb=>SELECT second, first FROM my_table;one,1 two,2 three,3 four,4
通过\pset改变输出格式
Alternatively, use the short commands:
[code]peter@localhost testdb=>\a \t \xOutput format is aligned. Tuples only is off. Expanded display is on. peter@localhost testdb=>SELECT * FROM my_table;-[ RECORD 1 ]- first | 1 second | one -[ RECORD 2 ]- first | 2 second | two -[ RECORD 3 ]- first | 3 second | three -[ RECORD 4 ]- first | 4 second | four \x Expanded display
相关文章推荐
- 数据库设计说明书
- Oracle VM VirtualBox +ubuntu server 搭建虚拟服务器局域网
- Oracle--常见Exception
- Mysql 多表联合查询效率分析及优化
- PostgreSql初探(1)-源码安装
- MySQL优化之——数据类型宽度
- Oracle同义词创建及其作用
- redis 通过 shell 将一个键值对从一个DB移动到另外一个DB
- SQL Server 2014 清理日志
- redis-3.0.2集群部署
- 数据库角色权限设计
- sql 查询数据长度
- nginx+tomcat7+redis集群配置
- oracle在schema是什么意思?
- 恢复oracle中误删除drop掉的表
- MongoDB 常用命令
- oracle ORA-01000: maximum open cursors exceeded问题的解决方法
- mysql远程链接不上,本地可以链接
- sql if
- Mysql 5.6 主从服务器数据同步