我正在尝试使用 JuliaDB 进行分组,一切正常,除非我想应用一次需要两列的函数。
JuliaDB.groupby(
(
TOTAL_PAID = :PRICE => sum,
FREQUENCY_IN_DAYS = :ORDER_DATE => handle_dates,
RECENCY_IN_DAYS = :ORDER_DATE => (x -> Dates.value(Date(now()) - maximum(x))),
COUNT_ORDERS_LAST_MONTH = :ORDER_DATE => countOnlyLastMonth,
TOTAL_PAID_LAST_MONTH = [:ORDER_DATE, :PRICE] => countOnlyLastMonth,
COUNT_ORDERS = length
),
t, :USER_KEY)
是这条线不起作用
TOTAL_PAID_LAST_MONTH = [:ORDER_DATE, :PRICE] => countOnlyLastMonth,
使用 DataFrames.groupby 你可以这样做:
[:ORDER_DATE, :PRICE] => countOnlyLastMonth => :TOTAL_PAID_LAST_MONTH,
我怎么能用 juliaDB 做到这一点?谢谢