PostgreSQL – How to Rename a User

To list the materialized views in a PostgreSQL database, you can query the system catalog tables. Materialized views are stored as objects in the database, and you can query the catalog to retrieve information about them. Here’s a query to list all materialized views in a PostgreSQL database: SELECT schemaname, matviewname FROM pg_matviews; Above query…

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.

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 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 use the ALTER DEFAULT PRIVILEGES statement in PostgreSQL database to set default privileges that will be applied to newly created objects in a schema. This is a powerful way to control access and permissions for objects created by a specific user or role in a particular schema. Here’s the basic syntax for using…

To drop a NOT NULL constraint from an existing column in a PostgreSQL table, you can use the ALTER TABLE statement with the ALTER COLUMN clause. Here’s the basic syntax: ALTER TABLE table_name ALTER COLUMN column_name DROP NOT NULL; where table_name is the name of the table containing the column and column_name is the name…