PostgreSQL – Psql 命令

Psql是一个用于处理 PostgreSQL 数据库的交互式终端。它用于更快、更有效地从 PostgreSQL 数据库服务器查询数据。在本文中，我们将研究一些最常用的 Psql 命令。

下表提供了常用的 Psql 命令：

Command	Description	Additional Information
psql -d database -U user -W	Connects to a database under a specific user	-d: used to state the database name -U:used to state the database user
psql -h host -d database -U user -W	Connect to a database that resides on another host	-h: used to state the host -d: used to state the database name -U:used to state the database user
psql -U user -h host “dbname=db sslmode=require”	Use SSL mode for the connection	-h: used to state the host -U:used to state the database user
\c dbname	Switch connection to a new database
\l	List available databases
\dt	List available tables
\d table_name	Describe a table such as a column, type, modifiers of columns, etc.
\dn	List all schemas of the currently connected database
\df	List available functions in the current database
\dv	List available views in the current database
\du	List all users and their assign roles
SELECT version();	Retrieve the current version of PostgreSQL server
\g	Exexute the last command again
\s	Display command history
\s filename	Save the command history to a file
\i filename	Execute psql commands from a file
\?	Know all available psql commands
\h	Get help	Eg:to get detailed information on ALTER TABLE statement use the \h ALTER TABLE
\e	Edit command in your own editor
\a	Switch from aligned to non-aligned column output
\H	Switch the output to HTML format
\q	Exit psql shell