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Explain three different rules that apply to NULLs when doing comparisons?

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Explain three different rules that apply to NULLs when doing comparisons?
posted Nov 11, 2014 by Archana

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1 Answer

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  1. For all operators except for concatenation (||), if a value in an expression
    is a NULL, that expression evaluates to NULL

  2. NULL is never equal or not equal to another value

  3. NULL is never TRUE or FALSE

answer Nov 12, 2014 by Arun Gowda
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