set @Client_ID = AttributeValue("_SubscriberKey")
set @ItemCode = AttributeValue("ItemCode")
set @CountofPurchases = LookupRows("Master_Purchases",'ItemCode',@ItemCode, 'Client_ID',@Client_ID)

if RowCount(@CountofPurchases) > 1
then
set @welcomemessage = 'Repeat Shopper'
else
  set @welcomemessage ='First time buyer'
endif