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GROUP BY Extensions in MS SQL Server

Introduction
GROUPING SETS
Summary

Instruction

Good job! One more interesting thing we can do with GROUPING SETS is combine them with ROLLUP or CUBE:

SELECT
  GROUPING_ID(DateReceived, CustomerId, RepairCenter) AS GroupingId,
  DateReceived,
  CustomerId,
  RepairCenter,
  AVG(RepairDuration) AS AvgRepairDuration
FROM WarrantyRepair
GROUP BY GROUPING SETS
(
  ROLLUP (CustomerId, RepairCenter),
  (DateReceived)
)

The query above will merge ROLLUP grouping levels with a grouping level based on DateReceived. As a result, we'll get the following grouping combinations:

LEAD

Exercise

Run the template query and note how many grouping levels are created.