Language Reference Guide > Language Reference Guide > System Classes > QueryCol Class > Expression Attribute
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Expression Attribute
Data Type: varchar(512)
4GL Access: RW
The Expression attribute contains a dynamic expression that the DBMS evaluates to load the appropriate value into the target column. This attribute is not relevant if the IsExpression attribute evaluates to FALSE.
This attribute is relevant only for a query object and its subclasses and not when used in conjunction with a DataStream or SQLSelect.
Last modified date: 12/20/2023