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Window Functions in PostgreSQL

When window functions are evaluated
Summary
18. Summary

Instruction

Excellent. It's time to wrap things up.

  • Window functions can only appear in the SELECT and ORDER BY clauses.
  • If you need 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 instead of the original table rows.

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Exercise

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