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How do you compute multiple aggregation levels at once (GROUPING SETS, ROLLUP, CUBE)?

Reporting often needs subtotals and grand totals across several dimensions, and stitching that with many UNIONs is wasteful. The signal is GROUPING SETS, ROLLUP, and CUBE in one pass.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Reporting often needs subtotals and grand totals across several dimensions, and stitching that with many UNIONs is wasteful. The signal is GROUPING SETS, ROLLUP, and CUBE in one pass.

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