RODBC: merge tables from different databases (channel)

Question

I\'m using RODBC package to connect to Oracle databases from R but I didn\'t succeed in merging tables from different databases without \"downloading\" the tables (I don\'t

Answer 1

In Netezza it is working fine using sqlQuery function.

require("RODBC")

ch <- odbcConnect("NZSQL")

dim.cust.acc1  <- sqlQuery(ch,"Select * from DB1..DIM_ACCOUNT a inner join DB2..BASE_201707 b on a.id_number=b.id_number limit 1000",believeNRows = FALSE)

Answer 2

This question is similar to the question here. The answer seems to be that RODBC cannot access two different databases in a single query, using sqlQuery(...), because the connection (channel) is database-specific. So either

(1) do it using downloads (as in your code), or 
(2) have your DBA put both tables in a single database, or 
(3) use something other than R.