Data Aggregation: The Big Picture from Small Details
Data aggregation rolls up granular records into high-level summaries, like turning individual sales logs into a daily sales report. It's used to power dashboards and speed up warehouse queries.
Data aggregation rolls up granular records into high-level summaries, trading individual detail for a big-picture view, like turning website clicks into a "total visitors per day" metric. It's fundamental for analytics dashboards and speeding up data warehouse queries by pre-calculating results. The main footgun is choosing the wrong function; an `AVERAGE` can be skewed by outliers, while a `MEDIAN` or `P99` might tell a more accurate story about typical behavior.
Read the original → Wikipedia: Aggregate data
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