[R] RODBC to query an Oracle table

[David Scott]

On Mon, 28 Jul 2008, Megan J Bellamy wrote:

> Hello all,
>
> I am having trouble running a count function in R using RODBC to query a table I created in Oracle. It may very well be that my SQL coding is incorrect; I just started learning it. But if someone could point me in the right direction or tell me if I am going about this the correct way that would be greatly appreciated! The script I have right now is:
>
>> require(RODBC) channel<-odbcConnect("MeganXE") stbl<-sqlQuery(channel, 
>> 'select plotnum, sampyear, sptype from density') sqlQuery(channel, 
>> 'select count (sampyear, plotnum, sptype) from stbl where sampyear=1995 
>> AND plotnum=1 AND sptype='S' OR sptype='H')
>
> I get this error: unexpected symbol in "sqlQuery(channel...)"
>
> I would like R to return a count of how many records satisfy the 
> condition of being sampled in 1995 and in plot number 1, where the 
> species type is either softwood or hardwood (S or H). Any help with this 
> would be great.
>
Well that error message I am almost certain is saying your SQL code is 
wrong and it is pretty easy to see that the quote marks will cause you 
problems.

Try using double quotes in the SQL code ("S", "H") and don't forget to 
close the single quote which starts at 'select. (That is you need a ' just 
before the closing bracket.

David scott



_________________________________________________________________
David Scott	Department of Statistics, Tamaki Campus
 		The University of Auckland, PB 92019
 		Auckland 1142,    NEW ZEALAND
Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
Email:	d.scott at auckland.ac.nz

Graduate Officer, Department of Statistics
Director of Consulting, Department of Statistics