20. Count total number of customers
“I was so afraid that we’ll have no signups at all, the numbers don’t look bad!” said Gessica, “Has anyone purchased though?”
Let’s practice combining filters more and calculate how many users who signed up within the first week are customers?
Hint
We already know how to filter signups from the first week after Bindle was launched. 
Now we need to filter it even more and from all such user records select the ones with a customer status. 
Solution
SELECT
COUNT(*)
FROM users
WHERE
created_at > '2018-01-01'
AND created_at < '2018-01-08'
AND status = 'customer'
![Anatoli Makarevich, author of SQL Habit]()
About SQL Habit
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 and exercises (you’re looking at one atm). They always have a real-life setting and detailed explanations. You can immediately apply everything you’ve learned at work. 
Fluent in SQL in a month
