Summarization

  • When we are aggregating data, we generally remove the detail data that lies below the summarize table.

  • The whole point of aggregation is to replace detail data with summaries. This is where subtotals comes in!

  • A grouping set is a set of columns by which you group.

  • The PostgreSQL ROLLUP is a subclass of the GROUP BY clause that offers shorthand for defining 'multiple grouping sets'

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