Ad hoc generation rules are rules that you create in the
Define | Data Generation
view of a project. Ad hoc rules do not have a name, and you cannot move an ad hoc rule. You can create ad hoc generation rules within the projects. You select the target columns for an ad hoc generation rule when you create the rule. You can select a standard generation technique for an ad hoc generation rule or you can select an ad hoc generation technique. You can use reference lookup, effective dates, and expression generation techniques only in an ad hoc generation rule. In an ad hoc rule, if you want to generate numbers in a column that uses string data type, you can change the data type to numeric.