GROUPFIRST

Syntax

GROUPFIRST(<any>; order by any)

This function returns a value in a group as specified by the ordered column's first value.

If the column used to order the group is a number, then the value used from the order column is the lowest number.
If the column used to order the group is a string, then the value used from the order column is the lowest number (in string form). If no numbers (in string form) are present, the first capital letter alphabetically is used. If no uppercase letters are present, the first lowercase letter alphabetically is used.
If the column used to order the group is a date, then the value used from the order column is the earliest date.

Given the following raw data:

Customer_number	Name	Order_number	Item

Customer_number	Name	Order_number	Item
2535	Jon	101544	Zamioculcas
2888	Mike	101567	Spider Lily
2535	Jon	101643	Datura
2535	Jon	101899	Dahlia
5788	Jon	102003	Snapdragon
2888	Mike	102248	Marguerite
2535	Jon	102282	Windflower
2888	Mike	102534	Elephant's Ear
2535	Jon	102612	Chinese Evergreen
5788	Jon	102617	Begonia
5788	Jon	102765	Starfish Plant
2535	Jon	102947	Hare's Foot Fern
2535	Jon	103001	Venus Flytrap
3545	Monique	103006	Red Flame Ivy

Create a group, using GROUPBY(#RawData!Customer_number), and GROUPBY(#RawData!Name).

Customer_number	Name

Using GROUPFIRST(#RawData!Item;#RawData!Order_number), you can return the first item ordered by each customer.

Customer_number	Name	First_Item