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56 lines
2.6 KiB
HTML
56 lines
2.6 KiB
HTML
<p>Table: <code>Delivery</code></p>
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<pre>
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+-----------------------------+---------+
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| Column Name | Type |
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+-----------------------------+---------+
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| delivery_id | int |
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| customer_id | int |
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| order_date | date |
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| customer_pref_delivery_date | date |
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+-----------------------------+---------+
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delivery_id is the column of unique values of this table.
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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).
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</pre>
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<p> </p>
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<p>If the customer's preferred delivery date is the same as the order date, then the order is called <strong>immediate;</strong> otherwise, it is called <strong>scheduled</strong>.</p>
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<p>The <strong>first order</strong> 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.</p>
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<p>Write a solution to find the percentage of immediate orders in the first orders of all customers, <strong>rounded to 2 decimal places</strong>.</p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Delivery table:
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+-------------+-------------+------------+-----------------------------+
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| delivery_id | customer_id | order_date | customer_pref_delivery_date |
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+-------------+-------------+------------+-----------------------------+
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| 1 | 1 | 2019-08-01 | 2019-08-02 |
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| 2 | 2 | 2019-08-02 | 2019-08-02 |
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| 3 | 1 | 2019-08-11 | 2019-08-12 |
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| 4 | 3 | 2019-08-24 | 2019-08-24 |
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| 5 | 3 | 2019-08-21 | 2019-08-22 |
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| 6 | 2 | 2019-08-11 | 2019-08-13 |
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| 7 | 4 | 2019-08-09 | 2019-08-09 |
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+-------------+-------------+------------+-----------------------------+
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<strong>Output:</strong>
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+----------------------+
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| immediate_percentage |
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+----------------------+
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| 50.00 |
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+----------------------+
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<strong>Explanation:</strong>
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The customer id 1 has a first order with delivery id 1 and it is scheduled.
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The customer id 2 has a first order with delivery id 2 and it is immediate.
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The customer id 3 has a first order with delivery id 5 and it is scheduled.
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The customer id 4 has a first order with delivery id 7 and it is immediate.
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Hence, half the customers have immediate first orders.
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</pre>
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