PET task 4 finished

aharlamcev/PET-project_task4

@@ -1,3 +1,4 @@
+CREATE MATERIALIZED VIEW users_cohort_analysis AS
 with needed_users as (
 						select distinct u.id as user_id, 
 						u.registration_date as reg_date, e.course_id, lv.id as view_id, 
@@ -24,3 +25,4 @@ ROUND(100.0 * active_users / users_in_cohort, 2) as retention_rate,
 courses_count::numeric / users_in_cohort as avg_courses_per_user,
 avg_time_to_first_view
 from CTE
+;