The PostgreSQL cheat sheet page provides you with the common PostgreSQL commands and statements that enable you to work with PostgreSQL quickly and effectively. This worked to connect to Postgres on DigitalOcean # -U is the username (it will appear in the l command) # -h is the name of the machine where the server is running. # -p is the port where the database listens to connections. Default is 5432. # -d is the name of the database to connect to. PostgreSQL Shell Cheat Sheet Starting the server. After you have run this command the first time, postgres will start automatically whenever you boot up your computer. PostgreSQL Cheat Sheet. Sequelize Cheat Sheet. Database Administration. Archived Section. Powered by GitBook. Sequelize Cheat Sheet. Sequelize documentation is horrendous, so here's a handy cheat sheet. Sequelize/PostgreSQL commands. Create a database. Createdb databasename. Initialize Sequelize. Create a Sequelize Model.

Summary: in this tutorial, we give you a list of common psql commands that help you query data from the PostgreSQL database server faster and more effectively.

1) Connect to PostgreSQL database

The following command connects to a database under a specific user. After pressing Enter PostgreSQL will ask for the password of the user.

For example, to connect to dvdrental database under postgres user, you use the following command:

If you want to connect to a database that resides on another host, you add the -h option as follows:

In case you want to use SSL mode for the connection, just specify it as shown in the following command:

2) Switch connection to a new database

Once you are connected to a database, you can switch the connection to a new database under a user specified by user. The previous connection will be closed. If you omit the user parameter, the current user is assumed.

The following command connects to dvdrental database under postgres user:

3) List available databases

To list all databases in the current PostgreSQL database server, you use l command:

4) List available tables

To list all tables in the current database, you use dt command:

Note that this command shows the only table in the currently connected database.

5) Describe a table

To describe a table such as a column, type, modifiers of columns, etc., you use the following command:

6) List available schema

To list all schemas of the currently connected database, you use the dn command.

7) List available functions

To list available functions in the current database, you use the df command.

8) List available views

To list available views in the current database, you use the dv command.

9) List users and their roles

To list all users and their assign roles, you use du command:

10) Execute the previous command

To retrieve the current version of PostgreSQL server, you use the version() function as follows:

Now, you want to save time typing the previous command again, you can use g command to execute the previous command:

psql executes the previous command again, which is the SELECT statement,.

11) Command history

To display command history, you use the s command.

If you want to save the command history to a file, you need to specify the file name followed the s command as follows:

12) Execute psql commands from a file

In case you want to execute psql commands from a file, you use i command as follows:

13) Get help on psql commands

To know all available psql commands, you use the ? command.

To get help on specific PostgreSQL statement, you use the h command.

For example, if you want to know detailed information on ALTER TABLE statement, you use the following command:

14) Turn on query execution time

To turn on query execution time, you use the timing command.

You use the same command timing to turn it off.

15) Edit command in your own editor

It is very handy if you can type the command in your favorite editor. To do this in psql, you e command. After issuing the command, psql will open the text editor defined by your EDITOR environment variable and place the most recent command that you entered in psql into the editor.

After you type the command in the editor, save it, and close the editor, psql will execute the command and return the result.

It is more useful when you edit a function in the editor.

16) Switch output options

psql supports some types of output format and allows you to customize how the output is formatted on the fly.

• a command switches from aligned to non-aligned column output.
• H command formats the output to HTML format.

17) Quit psql

Postgres Shell Commands

To quit psql, you use q command and press enter to exit psql.

Postgresql Commands Cheat Sheet Excel

In this tutorial, you have learned how to use psql commands to perform various commonly used tasks in PostgreSQL.