Computer Science · Structured Query Language
Which of the following database operations is typically the most expensive to execute on large datasets?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Running a COUNT() query on a small, cached lookup table.
- 2A simple SELECT statement utilizing a highly selective indexed WHERE clause.
- 3Performing an INNER JOIN using properly indexed primary/foreign keys.
- 4Executing a GROUP BY operation on a column that lacks an index.✓
Correct answer
Executing a GROUP BY operation on a column that lacks an index.
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