Experts in Postgres and Open Source Infrastructure

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.

Use the MAX() function along with a subquery to find a row having a maximum value in a given column. Users must use the subquery along with the WHERE clause to get the filtered result set.

Use the ORDER BY clause alongside the EXTRACT() function to sort a table by month. 'Month' must be passed as an argument to the EXTRACT() function.

To get the column’s type in Postgres all you need to do is simply pass the column name as an argument to the pg_typeof() function.

In Postgres, the pg_timezone_abbrevs() function, the “pg_timezone_names” view, and the pg_timezone_abbrevs view are used to get the list of PostgreSQL-supported timezones.