26. ANSI/SPARC 3-Level Architecture External Level Conceptual Level Internal Level External Schema 1 External Schema n Conceptual Schema Internal Schema Data Definition Data Manipulation Data Administration Associated Languages
27.
28. Index Table (Prescription) Doctor Name Patient Name Drug Name Date Frequency (per day) Dr. Lewis Zimmerman Tom Paris Tri-Ox 42231.2 2 Dr. Julian Bashir Odo Hyronalin 45432.1 3 Dr. Lewis Zimmerman Harry Kim Tri-Ox 42235.2 7 Dr. Beverly Crusher Lt. Data Hyronalin 45912.3 1 Dr. Julian Bashir Odo Synaptizine 48796.6 2 Dr. Lewis Zimmerman Tom Paris Priaxate 42765.5 90 Dr. Lewis Zimmerman Tom Paris Tri-Ox 42604.4 5 Dr. Lewis Zimmerman Katherine Janeway Hyronalin 45673.4 4 Dr. Phlox T’Pol Tri-Ox 37389.5 3 Dr. Lewis Zimmerman Dr. Beverly Crusher Dr. Julian Bashir Dr. Phlox
29. ANSI/SPARC 3-Level Architecture External Level Conceptual Level Internal Level External Schema 1 External Schema n Conceptual Schema Internal Schema Data Definition Data Manipulation Data Administration Associated Languages