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並前往https://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/

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

Assume that t2.id is defined as NOT NULL . In this case, MySQL scans t1 and looks up the rows in t2 using the values of t1.id . If MySQL ...

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