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(1) I do read the posting guide (the fact that I missread o missunderstood something does not imply not reading) (2) I could change NAs to 0 (I know) but I have previously (older versions of R and SQL*Plus) used the same select with the "right" output (namely with 0s). (3) AFAIK "strange" is not a negative remark and does not seem to me at the very least but that is always a

There is something strange in R behaviour (perhaps). I have run the same select in Oracle SQL*Plus (version 10.1.0.2.0) and the output comes out with NULLs (which is what it ougth to be). But in R I still get the same result with NAs (no matter I use na.strings or nullstring arguments) An output example follows below: Using na.string="0" and nullstring="0" (sorry by the