feat: add sql solution to lc problem: No.1435 (#752)

No.1435.Create a Session Bar Chart

Author: Dhoni77

solution/1400-1499/1435.Create a Session Bar Chart/README.md

@@ -64,7 +64,43 @@ Result 表：
 ### **SQL**
 
 ```sql
-
+(SELECT 
+    '[0-5>' bin,
+    SUM(CASE
+        WHEN duration / 60 < 5 THEN 1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[5-10>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 5
+                AND duration / 60 < 10)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[10-15>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 10
+                AND duration / 60 < 15)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '15 or more' bin,
+    SUM(CASE
+        WHEN duration / 60 >= 15 THEN 1
+        ELSE 0
+  END) total
+FROM
+    Sessions);	
 ```
 
 <!-- tabs:end -->

solution/1400-1499/1435.Create a Session Bar Chart/README_EN.md

@@ -65,7 +65,43 @@ For session_id 5 has a duration greater than or equal to 15 minutes.
 ### **SQL**
 
 ```sql
-
+(SELECT 
+    '[0-5>' bin,
+    SUM(CASE
+        WHEN duration / 60 < 5 THEN 1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[5-10>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 5
+                AND duration / 60 < 10)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[10-15>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 10
+                AND duration / 60 < 15)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '15 or more' bin,
+    SUM(CASE
+        WHEN duration / 60 >= 15 THEN 1
+        ELSE 0
+    END) total
+FROM
+    Sessions);	
 ```
 
 <!-- tabs:end -->

solution/1400-1499/1435.Create a Session Bar Chart/Solution.sql

@@ -0,0 +1,37 @@
+(SELECT 
+    '[0-5>' bin,
+    SUM(CASE
+        WHEN duration / 60 < 5 THEN 1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[5-10>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 5
+                AND duration / 60 < 10)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '[10-15>' bin,
+    SUM(CASE
+        WHEN
+            (duration / 60 >= 10
+                AND duration / 60 < 15)
+        THEN
+            1
+        ELSE 0
+    END) total
+FROM
+    Sessions) UNION (SELECT 
+    '15 or more' bin,
+    SUM(CASE
+        WHEN duration / 60 >= 15 THEN 1
+        ELSE 0
+    END) total
+FROM
+    Sessions);