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並前往https://dev.mysql.com/doc/refman/8.0/en/exists-and-not-exists-subqueries.html

13.2.11.6 Subqueries with EXISTS or NOT EXISTS - MySQL ...

If a subquery returns any rows at all, EXISTS subquery is TRUE , and NOT EXISTS subquery is FALSE . For example: SELECT column1 FROM t1 WHERE EXISTS (SELECT ...

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