Create reported-posts-ii.sql

Author: kamyu104

MySQL/reported-posts-ii.sql

@@ -0,0 +1,12 @@
+# Time:  O(m + n)
+# Space: O(n)
+
+SELECT ROUND(AVG(removal_percent), 2) average_daily_percent
+FROM
+  (SELECT a.action_date,
+          COUNT(DISTINCT r.post_id) / COUNT(DISTINCT a.post_id) * 100 removal_percent
+   FROM Actions a
+   LEFT JOIN Removals r ON a.post_id = r.post_id
+   WHERE a.extra = 'spam'
+   GROUP BY a.action_date
+   ORDER BY NULL) tmp