Tag
decomposition
- Jul 1, 2026 Join Dependencies and the Ternary Structure Fifth Normal Form Protects Why a relation can be pairwise lossless and still not be a join of two projections, how a three-way join dependency arises from a cyclic constraint, and what 5NF removes. databases
- Jun 10, 2026 Boyce-Codd Normal Form and the Cost of Losing a Dependency Why BCNF decomposition can make a functional dependency unverifiable without a join, how 3NF avoids that, and when the extra anomaly is the better trade. databases
- Aug 14, 2025 Multivalued Dependencies and the Redundancy BCNF Cannot See How an MVD asserts independence between two attribute groups, why the four-way combination of independent lists forces redundancy, and how 4NF decomposes on it. databases
- Apr 25, 2025 Sixth Normal Form and the Cost of One Attribute per Relation How a decomposition into key-plus-one-attribute relations removes every update anomaly by construction, what the extra joins cost, and which workloads make that cost worth paying. databases
- Dec 13, 2024 Information Hiding and the Parnas Decomposition Criterion How designing each module around a decision it conceals confines the cost of change, and what an interface must expose for that concealment to survive. software architecture