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Example of Null operator - NiNo Rule
If we wanted to make HIGHER_OF adhere to "NULL in, NULL out"-let's call it the NiNo rule-we would have to write something like what is shown in Example 2.1a.
Example: NiNo version of HIGHER_OF
CREATE FUNCTION HIGHER_OF ( A INTEGER, B INTEGER )
RETURNS INTEGER
CASE
WHEN A IS NULL OR B IS NULL
THEN RETURN CAST (NULL AS INTEGER);
WHEN A > B
THEN RETURN A;
ELSE RETURN B;
END CASE;
Explanation:
Using Operator VALUE: As you may expect, the operator VALUE returns the value of an object. The VALUE takes its argument a correlation variable. For illustration, to return a
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