CUBE, ROLLUP in SQL Server
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These operators are used with the GROUP BY clause and allow you to create subtotals, grand totals and superset of subtotals
The ROLLUP operator is used with the GROUP BY clause. It is used to create subtotals and grand totals for a set of columns. The summarized amounts are created based on the columns passed to the ROLLUP operator
The CUBE operators, like the ROLLUP operator produces subtotals and grand totals as well. But unlike the ROLLUP operator it produces subtotals and grand totals for every permutation of the columns provided to the CUBE operator