Postgres and Open Source Experts

In PostgreSQL, the UPDATE RETURNING clause not only updates the selected rows but also retrieves the modified rows.

To remove a Postgres sequence, execute the “DROP SEQUENCE” command followed by the sequence name to be dropped.

In PostgreSQL, the “\d” command and “pg_catalog” schema with the “pg_constraint” and “pg_class” views are used to get the list of table constraints.

In PostgreSQL, the “SELECT DISTINCT ON” statement is used to select one row per group. The stated command selects and retrieves a random row from each group.

In PostgreSQL, the FILTER clause can be used with the COUNT() function to do multiple counts on a particular table.

The CONCAT_WS() is an inbuilt string function and an extended form of the CONCAT() function which allows the users to put a specific separator between the strings to be concatenated

In PostgreSQL, the AGE() function must be used with the DATE_PART() or the EXTRACT() function to get the age in years.

In PostgreSQL, the DATE_PART() and EXTRACT() functions are used to get a specific date field such as a year, month, etc. from any date, timestamp, or interval.

In PostgreSQL, the ALTER SEQUENCE command is used with the RESTART WITH clause to reset the value of a specific sequence.

In PostgreSQL, the STRING_AGG() function can be utilized as an alternative to the MySQL's GROUP_CONCAT() function.