Computer Science · Database Management Systems
In SQL aggregation, what is the main difference between COUNT(column_name) and COUNT()?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Both expressions behave identically under all conditions.
- 2COUNT(column_name) is invalid SQL syntax and throws an error.
- 3COUNT(column_name) ignores NULL values, while COUNT() includes all rows regardless of NULLs.✓
- 4COUNT() ignores NULL values, while COUNT(column_name) includes them.
Correct answer
COUNT(column_name) ignores NULL values, while COUNT() includes all rows regardless of NULLs.
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