14
verbis
4y

This may be the best Stack Overflow comment I have seen when learning SQL.
How old is Frank? I don't know (null).
How old is Shirley? I don't know (null).
Are Frank and Shirley the same age?
Correct answer should be "I don't know" (null), not "no", as Frank and Shirley mightbe the same age, we simply don't know

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