[Solved] Which of the following best describes the CUBE operator in PostgreSQL? — Ans: It creates subtotals for all combinations of grouping columns | PostgreSQL

PostgreSQL - Aggregate Functions and GROUP BY

Which of the following best describes the CUBE operator in PostgreSQL?

AIt orders the result set in a cube pattern

BIt creates subtotals for all combinations of grouping columns

CIt filters rows based on cube-shaped data

DIt limits the number of rows returned

Step-by-Step Solution

Solution:

Step 1: Understand CUBE functionality
CUBE generates subtotals for every combination of the grouping columns, covering all possible groupings.
Step 2: Eliminate incorrect options
CUBE does not filter, order in cube shape, or limit rows; it aggregates data.
Final Answer:
It creates subtotals for all combinations of grouping columns -> Option B
Quick Check:
CUBE = all grouping combinations [OK]

Quick Trick: CUBE covers every grouping combination subtotal [OK]

Common Mistakes:

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Which of the following best describes the CUBE operator in PostgreSQL?