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Window functions and GROUP BY
Summary and Review
18. Summary


Excellent. It's time to wrap things up. Let's review what we learned in this section:

  • Window functions can only appear in the SELECT and ORDER BY clauses.
  • If you must use window functions in other parts of the query, use a subquery.
  • If the query uses aggregates or GROUP BY, remember that the window function can only see the grouped rows, not the original rows.

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