I have 3 tables like:

A                              AB                        B
-------------                  ------------              ---------------
a1                              a1,b1                    b1

AB is a transition table between A and B

With this, my classes have no composition within these two classes to each other. But I want to know that , with a JPQL Query, if any records exist for my element from A table in AB table. Just number or a boolean value is what I need.

Because AB is a transition table, there is no model object for it and I want to know if I can do this with a @Query in my Repository object.

jpa jpql
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