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Asked: 2026-06-07T17:20:55+00:00

Just a quick question. Want to join two tables A and B, where a_fk

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Just a quick question. Want to join two tables A and B, where a_fk is A’s table foreign key and b_pr is B’s primary key. Relation between A and B is one-to-one bidirectional.
A and B are corresponding to A and B table Entity classes.
I have jpql query "select b from A a, B b where a.a_fk=b.b_pr"; Eclipse fails to compile saying that column a_fk does not exist.
I have created a Native sql query and checked the same sql statement, but of course I have translated it to proper sql. And this works.

Question: JPQL does not support foreign keys?

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1 Answer

  1. Editorial Team

    JPQL uses entities and association between entties. It doesn’t use tables, column and foreign keys.

    If you want to select all As which have a B, the query is

    select a from A a inner join a.b

    If you want to select all As with their B

    select a from A a left join fetch a.b

    Read a book about JPA, because you haven’t grasped basic concepts about JPA.

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