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

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Table of Contents

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Overview

Function	Description
`ISNULL`	Checks whether a value is unknown.
`ISUNKNOWN`	Replaces a value if that value is unknown.
`IFUNKNOWN`	Alternative notation of the ISUNKNOWN function, which increases readability especially for long expressions.
`IS A`	Checks the entity type of an instance.
`TYPE OF`	Determines the entity type of an instance.
`ISACTIVE`	Determines if an instance of a specific entity type is currently active.
`GUID`	Generates a globally unique identifier which can later be used to uniquely mark and recognize a desired element.

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	Miscellaneous function ISNULL
	Miscellaneous function ISNULL

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	Miscellaneous function ISUNKNOWN
	Miscellaneous function ISUNKNOWN

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	Miscellaneous function IFUNKNOWN
	Miscellaneous function IFUNKNOWN

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	Miscellaneous function IS A
	Miscellaneous function IS A

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	Miscellaneous function TYPE OF
	Miscellaneous function TYPE OF

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	Miscellaneous function ISACTIVE
	Miscellaneous function ISACTIVE

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	Miscellaneous function GUID
	Miscellaneous function

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DOC:Miscellaneous function: ISNULL

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DOC:Miscellaneous function: ISUNKNOWN

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DOC:Miscellaneous function: IFUNKNOWN

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DOC:Miscellaneous function: ISNULL

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DOC:Miscellaneous function: IS A

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DOC:Miscellaneous function: TYPE OF

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DOC:Miscellaneous function: ISACTIVE

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DOC:Miscellaneous function: GUID