- Uniqueness of surrogate keys in dimension tables. - Referential integrity between fact and dimension tables. - Validation of relationships in the data model for analytical purposes.

I wasted 3 months memorizing random SQL concepts. Then I realized: They all fit into 9 categories. Everything changed. 𝐓𝐡𝐞 𝐌𝐄𝐆𝐀 𝐆𝐔𝐈𝐃𝐄: 1️⃣ Data Integrity PRIMARY KEY, FOREIGN KEY, UNIQUE ...

Stonebraker essentially abandoned Postgres in the mid-1990s. But instead of fading into obscurity, the codebase was salvaged ...

4️⃣ 04_orphan_detection.sql Detects orphaned events and subscriptions Uses left joins to find invalid foreign keys Excludes orphaned rows from the final dataset Key concepts: referential integrity, ...

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