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*SQLNULL Keyword

*SQLNULL is a special keyword like *NULL, but with a different meaning: *SQLNULL means the value for the field is unknown, whereas *NULL means the field is empty.

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Code Block
Define Field(#B) Type(*CHAR) Length(8) Input_Atr(ASQN) Default(*SQLNULL)

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Also See
ASQN (Allow SQL Nulls) attribute
Intrinsic Property .IsSqlNull
Intrinsic Method .AsValue
Assignment, Conditions, and Expressions with Fields allowing SQL Null