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Learn more about the functions ISNULLfunctions ISNULL, ISUNKNOWN, IFUNKOWNIFUNKNOWN, IS A, TYPE OF, ISACTIVE, GUID. 

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FunctionDescription
ISNULLChecks whether a value is unknown. 
ISUNKNOWNReplaces a value if that value is unknown.
IFUNKNOWNAlternative notation of the ISUNKOWN ISUNKNOWN function, which increases readability especially for long expressions.
IS AChecks the entity type of an instance.
TYPE OFDetermines the entity type of an instance.
ISACTIVEDetermines if an instance of a specific entity type is currently active.
GUIDGenerates a globally unique identifier which can later be used to uniquely mark and recognize a desired element. 

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