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…

To get the first day of the month from a date in PostgreSQL, you can use the DATE_TRUNC function. Here’s an example: SELECT DATE_TRUNC(‘month’, your_date_column) AS first_day_of_month FROM your_table; where your_date_column is the name of your date column and your_table is the name of your table. This query will return the first day of the…

You can use the json_object_keys function to extract the keys (field names) from a JSON object in PostgreSQL database. This function takes a JSON object as its argument and returns a set of text values representing the keys in the JSON object. Here is the basic syntax for the json_object_keys function: sqlCopy code json_object_keys(json_object) where…

You can refresh the data in a materialized view using the REFRESH MATERIALIZED VIEW statement in PostgreSQL database. A materialized view stores a snapshot of the data from the underlying tables, and this data can become stale over time. The REFRESH MATERIALIZED VIEW command allows you to update the materialized view with the latest data…

You can drop (delete) a materialized view using the DROP MATERIALIZED VIEW statement in PostgreSQL database. Here’s the basic syntax: DROP MATERIALIZED VIEW IF EXISTS view_name; where Here’s an example of dropping a materialized view named total_sales_by_product: DROP MATERIALIZED VIEW IF EXISTS total_sales_by_product; Make sure you exercise caution when using the DROP statement, as it…

Creating a materialized view in PostgreSQL involves using the CREATE MATERIALIZED VIEW statement. A materialized view is a precomputed and stored view of the data from one or more tables. Using materialized views can improve query performance by reducing the need to repeatedly compute the same complex queries. Here’s the basic syntax for creating a…

You can disable a user account in PostgreSQL database by revoking their login privileges. Disabling a user prevents them from connecting to the PostgreSQL database server. Here’s the basic syntax to revoke login privileges from a user globally: ALTER USER username NOLOGIN; Where username is the name of the user you want to lock/disable. By…

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…

You can rename a constraint in PostgreSQL database using the ALTER TABLE statement. Renaming a constraint is useful when you want to give it a more meaningful or descriptive name or if you need to change its name for any other reason. Here’s the basic syntax for renaming a constraint: ALTER TABLE table_name RENAME CONSTRAINT…

To rename a user in PostgreSQL, you can use the ALTER USER statement. Here’s the basic syntax: ALTER USER old_username RENAME TO new_username; where old_username is the current username you want to rename and new_username is the new username you want to assign. Below is an example: ALTER USER myuser RENAME TO newuser; This sql…