Added Lift Overloaded

Author: thecoddiwompler

Lift Overloaded/README.md

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+# [Lift Overloaded](https://www.namastesql.com/coding-problem/15-lift-overloaded-part-1)
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+
+---
+
+## 🛠️ Problem Statement
+
+  <b>Table Name : lifts</b>
+
+|  Column Name  |Type |
+| ------------- | ------------- |
+| id | int       |
+| capacity_kg          | int   |
+
+
+ <b>Table Name : lift_passengers</b>
+
+| COLUMN_NAME    | DATA_TYPE   |
+| ------------- | ------------- |
+| passenger_name | varchar(10) |
+| weight_kg      | int         |
+| lift_id        | int         |
+
+You are given a table of list of lifts , their maximum capacity and people along with their weight who wants to enter into it. You need to make sure maximum people enter into the lift without lift getting overloaded.
+
+For each lift, Write a SQL Query to find the comma separated list of people who can be accommodated. The comma separated list should have people in the order of their weight in increasing order.
+
+Display the output in increasing order of id.
+
+ <details>
+<summary>
+Input
+</summary>
+<br>
+  
+  <b>Table Name: lifts</b>
+
+|  id  |capacity_kg |
+| ------------- | ------------- |
+| 1 | 250 |
+| 2 | 280 |
+
+<b>Table Name: lift_passengers</b>
+
+|  passenger_name  | weight_kg | lift_id |
+| ------------- | ------------- | --- |
+| Dheeraj | 78 | 1 |
+| Adarsh | 70 | 1 | 
+| Rahul | 80 | 1 |
+| Srinivas | 85 | 1 |
+| Dushyant | 95 | 1 |
+| Priti | 50 | 2 |
+| Neha | 53 | 2 | 
+| Vimal | 58 | 2 |
+| Himanshi | 62 | 2 |
+| Akshay | 73 | 2 |
+| Devendra | 78 | 2 |
+| Amrendra | 83 | 2 |
+
+
+</details>
+
+<details>
+<summary>
+Output
+</summary>
+
+<br>
+
+| id |      passenger_list    |   
+|----|---------------------------|
+| 1 | Adarsh,Dheeraj,Rahul |
+| 2 | Priti,Neha,Vimal,Himanshi |

Lift Overloaded/schema.sql

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+CREATE TABLE lifts (id INT PRIMARY KEY, capacity_kg INT);
+
+CREATE TABLE lift_passengers (
+    passenger_name VARCHAR(100),
+    weight_kg INT,
+    lift_id INT,
+    FOREIGN KEY (lift_id) REFERENCES lifts(id)
+);
+
+INSERT INTO
+    lifts (id, capacity_kg)
+VALUES
+    (1, 250),
+    (2, 280);
+
+INSERT INTO
+    lift_passengers (passenger_name, weight_kg, lift_id)
+VALUES
+    ('Dheeraj', 78, 1),
+    ('Adarsh', 70, 1),
+    ('Rahul', 80, 1),
+    ('Srinivas', 85, 1),
+    ('Dushyant', 95, 1),
+    ('Priti', 50, 2),
+    ('Neha', 53, 2),
+    ('Vimal', 58, 2),
+    ('Himanshi', 62, 2),
+    ('Akshay', 73, 2),
+    ('Devendra', 78, 2),
+    ('Amrendra', 83, 2);

Lift Overloaded/solution.sql

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+WITH cte AS (
+    SELECT
+        a.id,
+        a.capacity_kg,
+        b.passenger_name,
+        b.weight_kg
+    FROM
+        lifts a
+        INNER JOIN lift_passengers b ON a.id = b.lift_id
+),
+intrmdt AS (
+    SELECT
+        id,
+        passenger_name,
+        sum(weight_kg) over(
+            PARTITION by id
+            ORDER BY
+                weight_kg
+        ) cum_sum_weight_kg,
+        capacity_kg
+    FROM
+        cte
+)
+SELECT
+    id,
+    string_agg(passenger_name, ',') passenger_list
+FROM
+    intrmdt
+WHERE
+    cum_sum_weight_kg <= capacity_kg
+GROUP BY
+    id;