Last updated on January 21st, 2025 at 03:55 am

Here, we see an Immediate Food Delivery I LeetCode Solution. This Leetcode problem is solved using MySQL and Pandas.

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Level of Question

Easy

Immediate Food Delivery I LeetCode Solution

1. Problem Statement

Column Name	Type
delivery_id	int
customer_id	int
order_date	date
customer_pref_delivery_date	date

delivery_id is the primary key of this table.
The table holds information about food delivery to customers that make orders at some date and specify a preferred delivery date (on the same order date or after it).

If the customer’s preferred delivery date of the customer is the same as the order date, then the order is called immediate otherwise it’s called scheduled.

Write an SQL query to find the percentage of immediate orders in the table, rounded to 2 decimal places.

The result format is in the following example.

Example 1:
Input:

delivery_id	customer_id	order_date	customer_pref_delivery_date
1	1	2019-08-01	2019-08-02
2	2	2019-08-02	2019-08-02
3	1	2019-08-11	2019-08-12
4	3	2019-08-24	2019-08-24
5	3	2019-08-21	2019-08-22
6	2	2019-08-11	2019-08-13
7	4	2019-08-09	2019-08-09

Output: 

immediate_percentage

33.33

Explanation: The orders with delivery id 2 and 3 are immediate while the others are scheduled.

2. Code Implementation in Different Languages

2.1 Immediate Food Delivery I MySQL

select 
  round(
    (
      select 
        count(*) 
      from 
        Delivery 
      where 
        order_date = customer_pref_delivery_date
    ) / (
      select 
        count(*) 
      from 
        Delivery
    ) * 100, 
    2
  ) as immediate_percentage;

2.2 Immediate Food Delivery I MySQL (Another approach)

select 
  round(
    sum(
      case when order_date = customer_pref_delivery_date then 1 else 0 end
    ) / count(delivery_id) * 100, 
    2
  ) as immediate_percentage 
from 
  Delivery;