J. Notes for Users of QUEL : QUEL Notes for the Using 4GL Chapter : Data Types for Simple Local Variables and Hidden Columns
 
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Data Types for Simple Local Variables and Hidden Columns
The format for declaring types in 4GL is the same as that used in create statements by the DBMS except that 4GL does not allow the with default or not default clauses.
A character value is a sequence of characters bounded by double quotation marks in a QUEL implementation.
Nullable versions of each data type are allowed in QUEL. By default, a type in QUEL is not nullable. You must use the with null clause to make it explicit. For example, to declare the type "nullable money," use the format money with null.