Dev Tools · 2h ago
How to query historical data in Postgres with SCD Type 4
A developer explains how to answer "what did my data look like last month" in Postgres using Slowly Changing Dimension Type 4. The pattern involves a history table plus triggers to capture row versions. It enables point-in-time queries without altering existing app queries.
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Practical guide for a common data modeling problem, but limited to Postgres users already familiar with triggers.
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