Postgres and Open Source Experts

To lock a Postgres user, the “ALTER USER” statement can be used with the “NOLOGIN” clause. While a user can be unlocked by using the “ALTER USER” command with the “LOGIN” attribute.

In Postgres, to check the active users via the “pg_stat_activity”, use the “SELECT usename, datname, state FROM pg_stat_activity WHERE usename='user_name';” command.

In PostgreSQL, the GRANT statement is utilized along with the “ON ALL TABLES” clause to assign permissions on all tables to single or multiple users.

To change or modify the table’s owner in PostgreSQL, use the “ALTER TABLE tab_name OWNER TO new_owner_name;” command.

In PostgreSQL, the “GRANT ALL” statement is utilized along with the “ON ALL TABLES IN SCHEMA” clause to assign permissions on the schema to single or multiple users.

In PostgreSQL, the “\z” command and “information_schema” can be used to check the list of assigned privileges to a certain Postgres table.

In PostgreSQL, the “\d”, the “\d+”, “information_schema”, and the “SELECT *” statement with the “FALSE” option are used to check the table’s structure.

The REVERSE() function accepts exactly one argument and that must be a string. As a result, it retrieves the given string in reverse order.

The STRING_TO_TABLE() function accepts a string and a delimiter as arguments and splits the given string based on the specified delimiter.

In PostgreSQL, the ORDER BY clause is used along with the COUNT() function to retrieve the table’s records by count/quantity.