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g1101_1200.s1174_immediate_food_delivery_ii.readme.md Maven / Gradle / Ivy

1174\. Immediate Food Delivery II

Medium

SQL Schema

Table: `Delivery`

    +-----------------------------+---------+ 
    | 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 is the same as the order date, then the order is called **immediate;** otherwise, it is called **scheduled**.

The **first order** of a customer is the order with the earliest order date that the customer made. It is guaranteed that a customer has precisely one first order.

Write an SQL query to find the percentage of immediate orders in the first orders of all customers, **rounded to 2 decimal places**.

The query result format is in the following example.

**Example 1:**

**Input:** Delivery table:

    +-------------+-------------+------------+-----------------------------+ 
    | 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 | 
    +----------------------+ 
    | 50.00                | 
    +----------------------+

**Explanation:**

The customer id 1 has a first order with delivery id 1 and it is scheduled.

The customer id 2 has a first order with delivery id 2 and it is immediate.

The customer id 3 has a first order with delivery id 5 and it is scheduled.

The customer id 4 has a first order with delivery id 7 and it is immediate.

Hence, half the customers have immediate first orders.