select * from ChildTable where not exists (select 1 from ParentTable where ChildTable.fielda != ParentTable.fielda)

>I must be missing something very simple. I am trying to find records in the child table that have no corresponding records in the parent table. Here is what I do:
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>select * from ChildTable join ParentTable where ChildTable.fielda != ParentTable.fielda
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>But it does not work. TIA.