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Function / value	Description
`AND`	Returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE.
`NOT`	Reverses the value of its boolean argument.
`OR`	Returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE.
`UNKNOWN`	Use the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value.
`TRUE`	This is the boolean value TRUE.
`FALSE`	This is the boolean value FALSE.

Functions

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	Logical function AND
	Logical function AND

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