What is NULLIF() and How to Use it in PostgreSQL? It is a built-in function in Postgres that accepts a couple of arguments and retrieves a NULL value if both arguments are equal or if either of the specified arguments is NULL. It retrieves the first argument if both arguments are not...
This write-up will teach you how to show databases in PostgreSQL via SQL Shell and pgAdmin. So, let’s get started. How to Show Databases in Postgres Using SQL Shell? Use the“\l”command from the SQL Shell to get the list of available databases. To achieve this purpose, use the foll...
Step 3: Restart the PostgreSQL Server Restart the PostgreSQL Server to ensure that the new “max_connections” value takes effect. For this purpose, open the “services” app, locate the “PostgreSQL” service, and click on the “restart” button: Once the PostgreSQL service is restarted, the...
PostgreSQL makes life easy for its users which are worried about managing and modifying the roles in databases. It is possible through the “ALTER ROLE” statement in PostgreSQL. Using the ALTERROLEstatement, users can change the name as well as the attributes of roles. Today, we will teach ...
Exit out of the PostgreSQL prompt by typing: \q Copy This will bring you back to thepostgresLinux command prompt. Accessing a Postgres Prompt Without Switching Accounts In the last example, you were instructed to get to the Postgres prompt by first switching to thepostgresuser and then running...
The installation procedure created a user account calledpostgresthat is associated with the defaultpostgresrole. In order to use PostgreSQL, you can log in to that account. There are a few ways to use this account to access the PostgreSQL prompt. ...
Then open the repository file using vi or vim; we have used vi to edit the below file. The file finds the base and updates section in the repository and inserts it by pressing “i” after opening and repository file. Then we need to insert “Exclude = PostgreSQL* in both sections after...
To test if PostgreSQL is working correctly, open psql by running the command: psql Copy You should see a prompt that looks like this: psql (12.2) Copy Type "help" for help. Copy You can test that PostgreSQL is working by creating a test database by running the following command in th...
Use the\qCommand to Terminate Script From the Command Line Utility in PostgreSQL If you are not already there, log in to your PSQL from the command prompt using the following statement. psql -u postgres Enter the username and continue. To quit the open session, type any of the following....
OS command prompt 1. Database SQL prompt In the Database SQL prompt, first, we need to login into the PostgreSQL database. We can login into the database by providing a username, password, hostname, and database name. Please find below the example to login to the database by providing...