A pointer to data stored in another file. The text associated with the DATALINK is the name of the file. The only default value allowed for DATALINK is NULL. DATALINK types have different attributes, which you can modify by selecting a column of type DATALINK in the Table dialog and then clicking Advanced on the Column page. To access the information that the DATALINK refers to, you must use an SQL scalar function. A file cannot be linked to more than once if Link control is specified for any link to that file.