NULL is a special Oracle value that may be applied to all data types.  It means that the value is unknown.

Therefore:
* Any IF condition evaluation with NULL will __always__ return False
* a NULL value must be tested for explicitly, in SQL, as thus:  IS NULL or IS NOT NULL
* Oracle provides for functions to handle Null conditions like [NVL]
* UserCalcs can test for Null conditions using the [EQNL|EQNL_OPERATOR] Operator


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![Notes|Edit:Internal.NULL] 	
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