https://axs.sdf.org/tags/data-quality/Recent content in Data Quality on Andrew StrykerHugoenandrewjstryker@proton.me (Andrew Stryker)andrewjstryker@proton.me (Andrew Stryker)Mon, 30 Mar 2026 00:00:00 +0000https://axs.sdf.org/2026/03/30/theoretical-foundations-of-the-warehouse-ontology/Mon, 30 Mar 2026 00:00:00 +0000andrewjstryker@proton.me (Andrew Stryker)https://axs.sdf.org/2026/03/30/theoretical-foundations-of-the-warehouse-ontology/<p>The <a href="https://axs.sdf.org/2026/03/30/an-ontology-of-data-warehouse-layers/">warehouse layer ontology</a> assigns each layer a single correctness guarantee. The idea is not new &mdash; it extends work that already exists at smaller scales.</p> <h2 id="codds-relational-integrity-constraints">Codd&rsquo;s Relational Integrity Constraints</h2> <p>Codd&rsquo;s <a href="https://dl.acm.org/doi/10.1145/16301.16303">relational integrity constraints</a> showed that correctness within a single database is not monolithic but <em>stratified</em>: domain constraints (each value in range), entity integrity (each row identifiable), and referential integrity (cross-table relationships consistent) form a hierarchy where each level presupposes the one below it.</p>