feat: update sql solution to lc problem: No.1322 (doocs#1815)

Author: thinkasany

solution/1300-1399/1322.Ads Performance/README.md

@@ -83,16 +83,11 @@ Ads 表:
 
 ```sql
 SELECT
-  ad_id,
-  IFNULL(ROUND(AVG(CASE
-    WHEN action = 'Clicked' THEN 1
-    WHEN action = 'Viewed' THEN 0
-    ELSE NULL
-  END) * 100, 2), 0) AS ctr
-FROM ads
-GROUP BY ad_id
-ORDER BY ctr DESC,
-ad_id ASC;
+    ad_id,
+    ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr
+FROM Ads
+GROUP BY 1
+ORDER BY 2 DESC, 1;
 ```
 
 <!-- tabs:end -->

solution/1300-1399/1322.Ads Performance/README_EN.md

@@ -76,16 +76,11 @@ Note that we do not care about Ignored Ads.
 
 ```sql
 SELECT
-  ad_id,
-  IFNULL(ROUND(AVG(CASE
-    WHEN action = 'Clicked' THEN 1
-    WHEN action = 'Viewed' THEN 0
-    ELSE NULL
-  END) * 100, 2), 0) AS ctr
-FROM ads
-GROUP BY ad_id
-ORDER BY ctr DESC,
-ad_id ASC;
+    ad_id,
+    ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr
+FROM Ads
+GROUP BY 1
+ORDER BY 2 DESC, 1;
 ```
 
 <!-- tabs:end -->

solution/1300-1399/1322.Ads Performance/Solution.sql

@@ -1,19 +1,7 @@
 # Write your MySQL query statement below
 SELECT
     ad_id,
-    IFNULL(
-        ROUND(
-            AVG(
-                CASE
-                    WHEN action = 'Clicked' THEN 1
-                    WHEN action = 'Viewed' THEN 0
-                    ELSE NULL
-                END
-            ) * 100,
-            2
-        ),
-        0
-    ) AS ctr
-FROM ads
-GROUP BY ad_id
-ORDER BY ctr DESC, ad_id ASC;
+    ROUND(IFNULL(SUM(action = 'Clicked') / SUM(action IN ('Clicked', 'Viewed')) * 100, 0), 2) AS ctr
+FROM Ads
+GROUP BY 1
+ORDER BY 2 DESC, 1;