SQL 中 EXISTS 和 IN 的區別？ - Difference between EXISTS and IN in SQL?

問題：

What is the difference between the EXISTS and IN clause in SQL? SQL 中的EXISTS和IN子句有什麼區別？

When should we use EXISTS , and when should we use IN ?我們什麼時候應該使用EXISTS ，什麼時候應該使用IN ？

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解決方案：

參考一： https://stackoom.com/question/6U5
參考二： Difference between EXISTS and IN in SQL?