Postgres and Open Source Experts

In PostgreSQL, a built-in DateTime function named JUSTIFY_DAYS() is used to adjust the 30-day time periods to months.

In PostgreSQL, the “\d” command and “information_schema.sequences” are used to describe a specific sequence.

In PostgreSQL, the MIN() and MAX() functions can be utilized to retrieve the minimum and maximum values among the list of given values.

To Upgrade PostgreSQL on CentOS 7, add the appropriate repository, stop PostgreSQL, upgrade PostgreSQL, restart PostgreSQL, verify the upgrade, and test the application compatibility.

In PostgreSQL, a commonly faced error “nextval: reached maximum value” error occurs when a sequence reaches its maximum value and the user is still trying to generate a new value.

To query data from a PostgreSQL table, open SQL Shell, and execute the “SELECT *” command followed by the table name.

In PostgreSQL, the “MINVALUE must be less than MAXVALUE” error can be resolved by increasing the value of the “MAXVLAUE” option and decreasing the value of the “MINVALUE” option or both at the same time.

In PostgreSQL, various in-built functions like pg_sleep(), pg_sleep_until(), and pg_sleep_for() are used to pause or delay the query’s execution for a specific period.

The PostgreSQL users can transform a string or a query result into a comma-separated list using a built-in aggregate function named STRING_AGG().

To restart the PostgreSQL server on CentOS 7, execute the “sudo systemctl restart postgresql” command. It is recommended to periodically restart the PostgreSQL server.