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並前往https://blog.jooq.org/not-in-vs-not-exists-vs-left-join-is-null-mysql/

NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: MySQL

... means of implementing an ANTI-JOIN in MySQL: http://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/

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