Returns the first occurrence of a value with respect to a date.
Sum the first AMOUNT_SOLD value relative to TIME_ID grouped by CUSTOMER_ID.
sum(firstVersion(SALES.SALES.AMOUNT_SOLD, SALES.SALES.CUSTOMER_ID, SALES.SALES.TIME_ID))
firstVersion(<type> value, <type> group_by, date order_by)
Returns the first occurrence of a value with respect to date (i.e. the order-by parameter). Unless used as a filter, this function must be used inside an aggregation function.