PostgreSQL – How to Drop A User

To find duplicate values in a PostgreSQL table, you can use the GROUP BY clause along with the HAVING clause. Here is the syntax: SELECT column_name, COUNT(column_name) AS count FROM your_table GROUP BY column_name HAVING COUNT(column_name) > 1; where your_table is the actual name of your table and column_name is the column for which you…

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…

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…

To drop (delete) a view in PostgreSQL, you can use the DROP VIEW statement followed by the name of the view you want to remove. Here’s the basic syntax for dropping a view: DROP VIEW [IF EXISTS] view_name; where Here’s an example of how to drop a view in PostgreSQL: DROP VIEW IF EXISTS high_salary_employees;…

You can use Sequences to generate unique integer values, often used as auto-incrementing primary keys in tables. You can obtain the current value and the next value of a sequence using the currval and nextval functions, respectively. These functions are typically used within SQL statements or in PL/pgSQL code. Current Value (currval): To get the…

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…