Last Person to Fit in the Bus

Hard
0/120
Average time to solve is 30m

Problem statement

Table: Queue


 Column Name    Data Type  
 person_id  INT
 person_name  VARCHAR
 weight  INT
 turn  INT


  • person_id is the primary key column for this table.
  • This table has the information about all people waiting for a bus.
  • The person_id and turn columns will contain all numbers from 1 to n, where n is the number of rows in the table.
  • Turn determines the order of which the people will board the bus, where turn=1 denotes the first person to board and turn=n denotes the last person to board.
  • weight is the weight of the person in kilograms.


There is a queue of people waiting to board a bus. However, the bus has a weight limit of 1000 kilograms, so there may be some people who cannot board.


Write an SQL query to find the person_name of the last person that can fit on the bus without exceeding the weight limit. The testcases are generated such that the first person does not exceed the weight limit.


The query result format is in the following example: Queue table:


 person_id    person_name    weight    turn  
 5  Alice  250  1
 4  Bob  175  5
 3  Alex  350  2
 6  John Cena  400  3
 1  Winston  500  6
 2  Marie  200  4


Result table: 
+-------------+
| person_name |
+-------------+
| John Cena   |
+-------------+
Solution
(100% EXP penalty)
Last Person to Fit in the Bus
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