ALTER TABLE rrna_db_xref ADD FOREIGN KEY (id) REFERENCES rrna(id) ON DELETE CASCADE;
ALTER TABLE rrna_function ADD FOREIGN KEY (id) REFERENCES rrna(id) ON DELETE CASCADE;
ALTER TABLE rrna_locus_tag ADD FOREIGN KEY (id) REFERENCES rrna(id) ON DELETE CASCADE;
ALTER TABLE rrna_names ADD FOREIGN KEY (id) REFERENCES rrna(id) ON DELETE CASCADE;
ALTER TABLE rrna_note ADD FOREIGN KEY (id) REFERENCES rrna(id) ON DELETE CASCADE;