268. Date and time functions

In this lesson, let’s list all scalar functions from the course that deal with dates and timestamps numbers:

now() / getdate()

The MySQL or PostgreSQL function now() is known as getdate() in Redshift. It returns the current timestamp and could be used to write queries that calculate metrics relative to the present moment:

SELECT SUM(*) AS revenue_last_30_days FROM purchases WHERE refunded = FALSE AND created_at > now() - '30 days'::interval 

DATE_PART(text, timestamp/interval)

The DATE_PART() function is used to extract...