https://nalar.dev/tags/schema-design/ Recent content in Schema Design on Nalar Hugo en-us Sat, 05 Sep 2026 00:00:00 +0700 https://nalar.dev/derive-row-values-in-sqlite-with-generated-columns/ Sat, 05 Sep 2026 00:00:00 +0700 https://nalar.dev/derive-row-values-in-sqlite-with-generated-columns/ <p>Applications often store values that can be calculated from other columns: an order-line total from quantity and unit price, a normalized search key from text, or a duration from two timestamps. The tempting approach is to calculate the value in application code and save both the inputs and the result.</p> <p>That creates two sources of truth. If one code path updates the inputs but forgets to update the derived value, the row becomes internally inconsistent.</p>