In [11]:
df
[
'FirstOrder'
]
=
FirstOrder
df
.
reset_index
(
inplace
=
True
)
df
.
head
()
Out[11]:
UserId
OrderId
OrderDate
OrderPeriod
FirstOrder
0
47
262
2009-01-11
2009-01
2009-01
1
47
278
2009-01-20
2009-01
2009-01
2
47
294
2009-02-03
2009-02
2009-01
3
47
301
2009-02-06
2009-02
2009-01
4
47
302
2009-02-06
2009-02
2009-01