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 (delete) a database in PostgreSQL, you can use the DROP DATABASE command. Be very cautious when using this command, as it permanently deletes all data in the specified database, and the operation is irreversible. Make sure you have appropriate permissions and a backup of any important data before proceeding. Here is the basic…
To get the last day of the month from a date in PostgreSQL, you can use the DATE_TRUNC function in combination with some date arithmetic. Here’s how you can do it: SELECT (DATE_TRUNC(‘MONTH’, your_date_column) + INTERVAL ‘1 MONTH – 1 DAY’) AS last_day_of_month FROM your_table; where your_date_column is the name of your date column and…
You can convert a string to a date using the TO_DATE function in PostgreSQL. This function allows you to specify the input string, the format of the string, and it will return a date accordingly. The general syntax of the TO_DATE function is as follows: TO_DATE(input_string, format_string) Here’s an example of using SELECT TO_DATE(‘2023-08-31’, ‘YYYY-MM-DD’);…
Superusers have full control over the database server and can perform any administrative task. Granting superuser privileges to a user should be done carefully, as it comes with significant power and responsibility. To grant superuser privileges to a user in PostgreSQL, follow these steps: Option 1: During PostgreSQL Installation Option 2: Using an Existing Superuser…
To remove special characters from a string in PostgreSQL, you can use a combination of string manipulation functions like REGEXP_REPLACE and regular expressions to target and replace those characters. Here’s an example of how you can remove special characters from a string: Suppose you have a table named “my_table” with a column “my_column” containing strings…
To list all databases in PostgreSQL, you can use the following SQL command: SELECT datname FROM pg_database; Above query will display a list of database names currently available on the server. You should have the necessary permissions to list databases on the PostgreSQL server. If you encounter permission issues, make sure you are logged in…