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2018 Feb 01
2
Data Table Merge Help
...???? Modified Name ?2016-01-01 ?5
Tracy????? Payables????? ?2015-01-01 ?34
Tom??????? Postal??????? ?2015-01-01 ?87
I was able to get this working by using the sqldf library, but it runs for a very long time in my actual dataset and I'd like to use data.table if at all possible.
library(sqldf)
joinString <- "SELECT A.PayeeName, B.Descr, A.PaymentDT, A.Amount
?????? ?????FROM dtDistributions A, dtDepartments B
??????????? WHERE A.DEPARTMENT = B.Department
??????????? AND B.EffDT = (SELECT MAX(ED.EffDT)
??????????????????????????? FROM dtDepartments ED
??????????????????????????? WHERE B.Depa...