The core of an electronic health record: patients and providers, appointments versus encounters, coded conditions and observations, prescriptions against a drug catalogue, allergies and insurance coverage over time.
Courses versus sections, terms, enrolments that carry the final grade, prerequisites as a self-join, assignments with weights, per-attempt submissions and idempotent attendance registers.
A reservation system that actually handles availability: room types versus rooms, rate plans, a per-night rate and inventory calendar, reservations broken down by night, payments and verified reviews.
A Jira-shaped tracker: projects with human-readable issue keys, subtasks through a self-reference, fractional board positions for drag-and-drop, labels, milestones, comments, attachments and a worklog.
Outpatient scheduling in MySQL: recurring availability templates that generate slots, appointments that consume exactly one slot, waitlists that backfill cancellations, two-way reminders, referrals, and a dated no-show policy.