🟢 Solve problem 1211

Author: AF2B

sql/1211.sql

@@ -0,0 +1,10 @@
+SELECT
+    query_name,
+    ROUND(AVG(rating / position), 2) AS quality,
+    ROUND(SUM(CASE WHEN rating < 3 THEN 1 ELSE 0 END) * 100.0 / COUNT(*), 2) AS poor_query_percentage
+FROM
+    Queries
+WHERE
+    query_name IS NOT NULL
+GROUP BY
+    query_name;