SQL查询

高频 SQL 50 题（基础版） - 学习计划 - 力扣（LeetCode）全球极客挚爱的技术成长平台

1757. 可回收且低脂的产品

SELECT product_id from Products 
WHERE low_fats = 'Y' AND recyclable = 'Y';

584. 寻找用户推荐人

SELECT name 
FROM Customer
WHERE referee_id <> '2' OR referee_id IS NULL;

595. 大的国家

SELECT name,population,area
FROM World
WHERE area >= '3000000' OR population >= '25000000';

1148. 文章浏览 I

SELECT DISTINCT author_id AS id 
FROM Views
WHERE author_id = viewer_id
ORDER BY id ASC;

1683. 无效的推文

SELECT tweet_id
FROM Tweets
WHERE LENGTH(content)>'15';