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並前往https://openjpa.apache.org/builds/1.2.0/apache-openjpa-1.2.0/docs/manual/jpa_langref.html

2. JPQL Language Reference - Apache OpenJPA

Subqueries may be used in the WHERE or HAVING clause. The syntax for subqueries is as follows: subquery ::= simple_select_clause subquery_from_clause [ ...

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