[Solved] Why does the SQL function MIN() ignore NULL values when calculating the minimum? — Ans: Because NULL means unknown, so it cannot be compared | SQL

SQL - Aggregate Functions

Why does the SQL function MIN() ignore NULL values when calculating the minimum?

ABecause NULL is the smallest possible value

BBecause NULL is treated as zero automatically

CBecause NULL values cause syntax errors

DBecause NULL means unknown, so it cannot be compared

Step-by-Step Solution

Solution:

Step 1: Understand NULL meaning in SQL
NULL represents unknown or missing data, not a value.
Step 2: Explain why NULL is ignored
Since NULL cannot be compared, aggregate functions skip NULLs to find actual minimum values.
Final Answer:
Because NULL means unknown, so it cannot be compared -> Option D
Quick Check:
NULLs are ignored in MIN() and MAX() [OK]

Quick Trick: MIN() and MAX() skip NULLs because they are unknown [OK]

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Why does the SQL function MIN() ignore NULL values when calculating the minimum?