Following existing comparison rules, a condition with a DEFAULT function used with comparison operators other than IS NULL or IS NOT NULL is unknown if the DEFAULT function evaluates to null.
A condition other than IS NULL or IS NOT NULL with a DEFAULT function compared with a null evaluates to unknown.
IF a DEFAULT function is used with … | THEN the comparison is … |
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IS NULL |
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IS NOT NULL |
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For more information about the DEFAULT function, see Teradata Vantage™ SQL Functions, Expressions, and Predicates, B035-1145.