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...
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About SQL Habit
Hi, it’s Anatoli, the author of SQL Habit. 
SQL Habit is a course (or, as some of the students say, “business simulator”). It’s based on a story of a fictional startup called Bindle. You’ll play a role of their Data Analyst
and solve real-life challenges from Business, Marketing, and Product Management.
SQL Habit course is made of bite-sized lessons (you’re looking at one atm) and exercises. They always have a real-life setting and detailed explanations. You can immediately apply everything you’ve learned at work. 