Displaying 1 result from an estimated 1 matches for "tp21395414p21437847".
2009 Jan 11
1
temporal join
I have dataframe a:
sym date val1
=== ==== ====
foo 20090101 a1
foo 20090102 a2
foo 20090103 a3
and dataframe b:
sym date val2
=== ==== ====
foo 20090104 b1
I would like to join/merge them to generate the following:
sym date val2 val1
=== ==== ==== ====
foo 20090104 b1 a3
i.e. an equijoin on column 'sym' and a temporal join on column 'date'
where the closest matching row is