This Leetcode problem Immediate Food Delivery I LeetCode Solution is done in SQL.

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Immediate Food Delivery I LeetCode Solution

Problem Statement

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:

<strong>Output:</strong> Code language: HTML, XML (xml)

<strong>Explanation:</strong> The orders with delivery id 2 and 3 are immediate while the others are scheduled.Code language: HTML, XML (xml)

Immediate Food Delivery I LeetCode Solution MySQL

select 
  round(
    (
      select 
        count(*) 
      from 
        Delivery 
      where 
        order_date = customer_pref_delivery_date
    ) / (
      select 
        count(*) 
      from 
        Delivery
    ) * 100, 
    2
  ) as immediate_percentage;Code language: SQL (Structured Query Language) (sql)

Immediate Food Delivery I LeetCode Solution 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;Code language: SQL (Structured Query Language) (sql)