feat: add sql solution to lc problem: No.1294

No.1294.Weather Type in Each Country

Author: yanglbme

solution/1200-1299/1294.Weather Type in Each Country/README.md

@@ -106,7 +106,21 @@ Morocco 11 月的平均 weather_state 为 (25 + 27 + 31) / 3 = 27.667 所以天
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+select
+    country_name,
+    case
+        when avg(weather_state) <= 15 then 'Cold'
+        when avg(weather_state) >= 25 then 'Hot'
+        else 'Warm'
+    end weather_type
+from
+    Weather w
+    join Countries c on w.country_id = c.country_id
+where
+    date_format(day, '%Y-%m') = '2019-11'
+group by
+    w.country_id
 ```
 
 <!-- tabs:end -->

solution/1200-1299/1294.Weather Type in Each Country/README_EN.md

@@ -113,7 +113,21 @@ We know nothing about the average weather_state in Spain in November so we do no
 ### **SQL**
 
 ```sql
-
+# Write your MySQL query statement below
+select
+    country_name,
+    case
+        when avg(weather_state) <= 15 then 'Cold'
+        when avg(weather_state) >= 25 then 'Hot'
+        else 'Warm'
+    end weather_type
+from
+    Weather w
+    join Countries c on w.country_id = c.country_id
+where
+    date_format(day, '%Y-%m') = '2019-11'
+group by
+    w.country_id
 ```
 
 <!-- tabs:end -->

solution/1200-1299/1294.Weather Type in Each Country/Solution.sql

@@ -0,0 +1,15 @@
+# Write your MySQL query statement below
+select
+    country_name,
+    case
+        when avg(weather_state) <= 15 then 'Cold'
+        when avg(weather_state) >= 25 then 'Hot'
+        else 'Warm'
+    end weather_type
+from
+    Weather w
+    join Countries c on w.country_id = c.country_id
+where
+    date_format(day, '%Y-%m') = '2019-11'
+group by
+    w.country_id