Figure 3.

Dependencies in the database schema. Parent tables contain primary keys that child tables reference as foreign keys. The main table medline_citation, is a parent of thirteen other tables. The table medline_mesh_heading is a parent of medline_mesh_heading_qualifier.

Oliver et al. BMC Bioinformatics 2004 5:146   doi:10.1186/1471-2105-5-146
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