Database: cre_Doc_and_collections (difficulty: simple)
Question: What are the document object ids of the related to the document owned by Marlin ?
SQL: select t1.document_object_id from document_subset_members as t1 join document_objects as t2 on t1.document_object_id  =  t2.document_object_id where t2.owner  =  'Marlin'