Language Reference Guide : System Classes : QueryCol Class : IsExpression Attribute
 
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IsExpression Attribute
Data Type: smallint
4GL Access: RW
Set the IsExpression attribute to TRUE if a column contains a simple value or an expression to be evaluated by the DBMS. If this attribute is set to TRUE, the Expression attribute must contain an expression string.
This attribute is irrelevant when used in conjunction with SQLSelect objects.