To list all installed extensions in PostgreSQL, you can query the pg_extension system catalog table as shown below:
SELECT extname FROM pg_extension;This query retrieves the names of all installed extensions in your PostgreSQL database.
You can convert a timestamp to a date in PostgreSQL using the DATE function. If you have a timestamp column named “order_ts” in a table called “orders,” you can use the following query to convert the timestamp to a date: SELECT DATE(order_ts) FROM orders; This will return a result set where each row contains the…
You can concatenate strings using the || operator or the CONCAT() function in PostgreSQL database. Here are examples of both methods: Using the || Operator: The || operator is used to concatenate two or more strings together. SELECT ‘Hello ‘ || ‘World’; You can also concatenate columns from a table: SELECT first_name || ‘ ‘…
To change a user’s password in PostgreSQL, you can use the ALTER USER statement. Here’s how you can change a user’s password: Connect to PostgreSQL: You need to connect to your PostgreSQL server using a user account with superuser or administrative privileges, as only superusers can change the passwords of other users. Change the Password:To…
To list all columns of a table in PostgreSQL, you can use the \d command within the psql command-line tool or use SQL queries to retrieve column information from the system catalog. Here are a couple of methods to accomplish this: Method 1: Using psql Open a terminal and start the psql command-line tool by…
To list the tables used by a view in PostgreSQL, you can query the system catalog to inspect the view’s underlying SQL query. PostgreSQL stores view definitions in the pg_views system catalog table. Here’s how you can retrieve the tables used by a specific view: SELECT table_name FROM information_schema.tables WHERE table_schema = ‘public’ AND table_name…
You can change the current role within a database session in PostgreSQL database using SET ROLE statement . Changing the role allows you to temporarily assume the permissions and privileges associated with a different role, which can be useful for specific tasks or actions that require different access rights. This can be particularly helpful in…