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6 Rules Every Database Designer Should Know

Description Choosing the right primary key can make—or break—your database. In this short lesson, we walk through six essential characteristics of a good primary key and why each one matters for integrity, performance, and security. What you’ll learn Why the DBMS relies on primary keys to uniquely identify rows The Six: 1. Entity integrity (unique & NOT NULL) 2. Non-descriptive (no embedded business meaning) 3. Non-volatile (stable over time) 4. Prefer single-attribute (except bridge tables) 5. Prefer numeric (easy to auto-generate) 6. Security-compliant (never use sensitive values like SSNs) A quick checklist you can apply to every table you design Who it’s for: Students, new developers, and anyone modeling databases or building ERDs (Crow’s Foot). If this helped, like & subscribe—and drop your PK “anti-patterns” in the comments! #DatabaseDesign #PrimaryKey #SQL #ERD #Normalization #RelationalDatabase