Summarizing customer information
In most business decisions customers are analyzed in groups, such as customers per country or customers per age group.
Bu egzersiz
Data-Driven Decision Making in SQL
kursunun bir parçasıdırUygulamalı interaktif egzersiz
Bu örnek kodu tamamlayarak bu egzersizi bitirin.
SELECT ___ -- Count the total number of customers
FROM customers
WHERE date_of_birth ___; -- Select customers born between 1980-01-01 and 1989-12-31