SQL 문제풀이
leetcode - 1173. Immediate Food Delivery I
Jerrytwo
2022. 7. 1. 15:57
난이도 : Easy
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.
Write an SQL query to find the percentage of immediate orders in the table, rounded to 2 decimal places.
case문을 활용한 방법
SELECT ROUND(SUM(CASE WHEN order_date = customer_pref_delivery_date
THEN 1
ELSE 0
END) * 100 / COUNT(order_date), 2) immediate_percentage
FROM Delivery
Accepted (10.27%)
case문을 활용하지 않은 방법
SELECT ROUND(SUM(order_date = customer_pref_delivery_date) * 100
/ COUNT(order_date), 2) immediate_percentage
FROM Delivery
Accepted (21.24%)