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Tech Tip: Dealing with NULL values in the 4D language
PRODUCT: 4D Developer | VERSION: 11 | PLATFORM: Mac & Win
Published On: January 9, 2008
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The 4D language cannot operate directly on values in fields that are NULL. However, there is a command that you can use to check to see if the field of the current record is NULL or not.

Is field value Null returns a True if it is NULL, and a False if it is not.