Experts in Postgres and Open Source Infrastructure

In PostgreSQL, an already created view can be altered by utilizing the UPDATE query followed by the view name and then specifying the column to be updated in the SET clause.

To sort a table by month name use the ORDER BY clause alongside the EXTRACT() and TO_DATE() functions. 'Month' must be specified as an argument to the EXTRACT() and TO_DATE() functions.

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.