s-takaya1027 https://blog.hatena.ne.jp/s-takaya1027/ 何かやってみるブログ https://takayasugiyama.com/ 問題 leetcode.com 解いた サブクエリで該当のsales_idを引っ張ってくるだけ。 SELECT name FROM SalesPerson WHERE sales_id NOT IN( SELECT sales_id AS id FROM Orders LEFT OUTER JOIN Company ON Orders.com_id = Company.com_id WHERE Company.name = 'RED'); 結果 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftakayasugiyama.com%2Fentry%2F2022%2F04%2F25%2F000317" title="LeetCode Sales Personを解いてみた - 何かやってみるブログ" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/s/s-takaya1027/20220425/20220425000112.png Hatena Blog https://hatena.blog 2022-04-25 00:03:17 rich https://takayasugiyama.com/entry/2022/04/25/000317 1.0 100%