Singular data elements are those data elements that are not repeated within the mail message. For example, your message greeting (Ex: Dear Joe) where Joe is a singular data element.
To insert singular data elements you use the syntax ##TABLENAME.COLUMNNAME##. Table name corresponds to the table name defined in the NTS_NOTIFICATION_DETAIL table for the notification event. Column name corresponds to the column name of the result set as specified within the notification event stored procedure.
You can insert the same singular data element tag in a template multiple times if required. At runtime every instance of the data element tag is replaced with data from the result set. If no data exists in the column for the result set the data element tag is removed from the message and an empty space is put in its place.