What are the common commands in postgresql?

Postgresql commonly used commands psql, createdb, dropdb, createuser, dropuser, \l, \c, \dt, \d table_name, \du, \i file_name, \e and \q, etc. Detailed introduction: 1. psql is the command line interface tool of PostgreSQL. It allows users to connect to the database server and perform various database operations. Through psql, you can perform SQL queries, create and manage databases, tables, etc.

PostgreSQL is an open source relational database management system that is widely used for data storage and management in various applications and websites. When using PostgreSQL, there are many commonly used commands that can help us operate and manage the database. The following is an introduction to some commonly used PostgreSQL commands:

1. psql: psql is the command line interface tool for PostgreSQL. It allows users to connect to the database server and perform various database operations. Through psql, you can execute SQL queries, create and manage databases, tables and indexes, etc.

2. createdb: This command is used to create a new database. When using the createdb command, you can specify the name of the database and other options, such as the owner of the database, character set, etc.

3. dropdb: This command is used to delete an existing database. When using the dropdb command, you need to specify the name of the database to be dropped.

4. createuser: This command is used to create a new database user. When using the createuser command, you can specify the user's name, password, role, etc.

5. dropuser: This command is used to delete an existing database user. When using the dropuser command, you need to specify the name of the user to be deleted.

6. \l: This command is used to list all databases on the current database server.

7. \c: This command is used to connect to the specified database. When using the \c command, you need to specify the name of the database to connect to.

8. \dt: This command is used to list all tables in the current database.

9. \d table_name: This command is used to display the structure of the specified table. When using the \d command, you need to specify the name of the table in which the structure is to be displayed.

10. \du: This command is used to list all users in the current database.

11. \i file_name: This command is used to execute a SQL script file. When using the \i command, you need to specify the path and name of the script file to be executed.

12. \e: This command is used to open a text editor to edit and execute SQL statements in psql.

13. \q: This command is used to exit psql.

In addition to the above common commands, PostgreSQL also provides many other commands and functions for more advanced database management and operations. For example, you can use the ALTER TABLE command to modify the structure of the table, use the INSERT, UPDATE, and DELETE commands to insert, update, and delete data in the table, and use the SELECT command to query data, etc.

To sum up, PostgreSQL’s common commands can help us perform various operations in the database, including creating and deleting databases, tables and users, querying and modifying data, etc. Proficiency in these commands will enable us to manage and operate PostgreSQL databases more efficiently.

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