last(value: storable, [order_by(...)]?) -> value

Return the last value of one column across an ordered group.

If no ordering is specified, the default ordering is that of the invoking verb, which is generally the 'valid_from' timestamp, ascending. In this case, the last value is the latest.

Domain

This is an aggregate function (aggregates rows over a group in aggregate verbs).

This is a window function (calculates over a group of multiple input rows using windowing).

Categories

• Aggregate
• Window

Examples

make_col last_customer:window(last(customer_id), group_by(category))

Find out the customer that appears last within each category.

statsby last_customer:last(customer_id), group_by(category)

Find out the customer that appears last within each category.

statsby first_customer:last(customer_id, order_by(login_time)), group_by(category)

Find out the customer that logged in last within each category.