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However, if that cannot bedone theconfiguration variable is available.
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Tip: Some applications might expect that expression =NULL returns true if expression evaluates to the null value.It is highly recommended that these applications be modifiedto comply with the SQL standard. (The null value represents an unknown value,and it is not known whether two unknown values are equal.). Similarly, IS NOT DISTINCT FROM is identical to = for non-null inputs, but it returns true whenboth inputs are null, and false when only one input is null.Thus, these constructs effectively act as though null were anormal data value, rather than 'unknown'.To check whether a value is or is not null, use theconstructs: expression IS NULLexpression IS NOT NULLor the equivalent, but nonstandard, constructs: expression ISNULLexpression NOTNULLDo not writeexpression =NULL because NULL is not'equal to' NULL.
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When this behavior is not suitable, use the IS NOT DISTINCTFROM constructs: a IS DISTINCT FROM b a IS NOT DISTINCT FROM bFor non-null inputs, IS DISTINCT FROMis the same as the operator.However, if both inputs are null it returns false, and if onlyone input is null it returns true.
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