Validating null value in oracle sql
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Because of this additional complexity, the idea of multiple Nulls with different definitions has not gained widespread acceptance in the database practitioners' domain.It remains an active field of research though, with numerous papers still being published.In fact, NULL is untyped in the SQL language, which is why you cannot validly use it in an equality comparison.You need the special @Jack - Actually, taking a cursory look at this posting of the SQL-92 standard, section 4.1 states: "A null value is an implementation-dependent special value that is distinct from all non-null values of the associated data type.In Codd's book, these two Null-type markers are referred to as 'A-Values' and 'I-Values', representing 'Missing But Applicable' and 'Missing But Inapplicable', respectively.
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As Fabricio Araujo hinted, NULL is not really a value like the number 4 or string 'bacon strips'.In database theory circles, the original proposal of Codd (1975, 1979) is now referred to as "Codd tables".
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