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GROUP BY Extensions in MS SQL Server

Introduction
Summary
15. Summary

Instruction

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  1. GROUP BY GROUPING SETS( ) works by creating the grouping levels provided explicitly within its parentheses.
  2. You can use a pair of empty parentheses ( ) to introduce a general average, sum, etc.
  3. The GROUPING SETS extension can be combined with both GROUPING_ID and COALESCE().
  4. You can use both ROLLUP and CUBE to create even more sophisticated grouping combinations.

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Exercise

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