PostgreSQL – How to Disable(Lock) a User

To list all the tables in a PostgreSQL database, you can query the information_schema database which contains metadata about all the tables and other objects in the database. Below is the SQL query you can use to show all the tables: SELECT table_name FROM information_schema.tables WHERE table_schema = ‘public’; This query will retrieve the names…

You can create a view using the CREATE VIEW statement in PostgreSQL database. A view is a virtual table that is based on the result of a SELECT query. Views allow you to present a subset of data from one or more tables in a structured way, making it easier to query and retrieve specific…

To revert to the original role of the logged in user, you can use the RESET ROLE statement. This will revert to the role of the logged-in user. Here is the syntax of using the RESET ROLE command: RESET ROLE; I’m currently logged in as user ‘postgres’ as shown in the below screenshot: Using the…

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…

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 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…