To get the name of the current database in PostgreSQL, you can use the following SQL query:
SELECT current_database();When you execute this query, it will return the name of the database that you are currently connected to.
For example, if you are connected to a database named “my_database,” executing the query will return “my_database” as the result.
To drop a user in PostgreSQL, you can use the DROP USER statement. Here’s the basic syntax for dropping a user: DROP USER user_name; where user_name is the name of the user you want to drop. Always exercise caution when dropping users, especially in a production environment, as it will permanently remove the user and…
You can drop a sequence using the DROP SEQUENCE command. Here’s the basic syntax to drop a sequence: DROP SEQUENCE [ IF EXISTS ] sequence_name [, …] [ CASCADE | RESTRICT ]; Here are some examples of using the DROP SEQUENCE command: Drop a sequence without checking for dependencies: DROP SEQUENCE my_sequence; Drop a sequence…
To get the version of your PostgreSQL database, you can use the SQL query below when connected to the database: SELECT version(); When you run this query, it will return a result similar to the following: PostgreSQL x.x.x on x86_64-pc-linux-gnu, compiled by … In the result, “x.x.x” represents the PostgreSQL version number. It also provides…
To extract the month from a date in PostgreSQL, you can use the EXTRACT function. Here’s an example: SELECT EXTRACT(MONTH FROM your_date_column) AS month FROM your_table; where your_date_column is the name of your date column and your_table is the name of your table. In this query, EXTRACT(MONTH FROM your_date_column) is used to extract the month…
You can rename a view using the ALTER VIEW statement with the RENAME TO clause in PostgreSQL database. Renaming a view can be useful when you want to change its name to something more meaningful or descriptive. Here’s the basic syntax for renaming a view: ALTER VIEW old_view_name RENAME TO new_view_name; where old_view_name is the…
To retrieve the Data Definition Language (DDL) script for a specific view in PostgreSQL, you can use the pg_get_viewdef function. This function allows you to obtain the SQL statement that defines the view. Here’s how you can use it: SELECT pg_get_viewdef(‘view_name’, true); Replace ‘view_name’ with the name of the view for which you want to…