题目链接：点击打开链接
题目大意：略。
解题思路
“2020年”的11种写法
- YEAR(sale_date) = 2020
- sale_date LIKE '2020%'
- sale_date REGEXP '^2020'
- LEFT(sale_date,4) = '2020'
- MID(sale_date,1,4) = '2020'
- SUBSTR(sale_date,1,4) = '2020'
- DATE_FORMAT(sale_date,'%Y') = 2020
- EXTRACT(YEAR FROM sale_date) = 2020
- sale_date BETWEEN '2020-01-01' AND '2020-12-31'
- sale_date > '2019-12-31' AND sale_date < '2021-01-01'
- sale_date >= '2020-01-01' AND sale_date <= '2020-12-31'
AC 代码
SELECT seller_name
FROM Seller
WHERE seller_id NOT IN (SELECT DISTINCT seller_id
FROM Orders
WHERE YEAR(sale_date) = '2020' AND seller_id)
ORDER BY seller_name
