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Questions like this one, which rely on order or duration between events, are hard to approach using relational data and SQL. They usually involve 50+ lines of window functions and/or self-joins with all the ensuing debugging (View Highlight)

Complex systems can be described through their state or history. For example, the game of chess is usually specified (View Highlight)

Most analytics data comes in as “history” (events) but analytics in data warehouses today is done through the “state” (View Highlight)