[R] R -SQL
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed May 18 14:37:21 CEST 2005
You have not told us what package you are using (and I think this is a
repeat of a post also missing that crucial information).
However, the main problem appears to be that you think & operates on
character strings. You have not told us your intentions, which might have
been
paste("select ... crit.Title=", criteria$Title[j], ";", sep="")
On Wed, 18 May 2005, Navarre Sabine wrote:
> Hello,
>
> I've got a problem in a sql query!
>
>
> for(j in 1:length(criteria$Title))
>
> {
> graphe_par<-sqlQuery(channel,"select q.type,crit.Title, r.Value from
> criteria crit, reply r,question_reply qr, question q, question_criteria
> qc, form_question fq where qr.reply=r.ID and qr.question=q.ID and
> qc.question=q.ID and crit.ID=qc.criteria and fq.question=q.ID and
> fq.form=4 and crit.Title=" & criteria$Title[j] &";")
>
> ............}
>
>
>> criteria$Title
> [1] Content Logistic Trainer Supply User contribution
> Levels: Content Logistic Supply Trainer User contribution
>
>
> The error is:
> Error in "select q.type,crit.Title, r.Value from criteria crit, reply r,question_reply qr, question q, question_criteria qc, form_question fq where qr.reply=r.ID and qr.question=q.ID and qc.question=q.ID and crit.ID=qc.criteria and fq.question=q.ID and fq.form=4 and crit.Title=" & :
> operations are possible only for numeric or logical types
> In addition: Warning message:
> & not meaningful for factors in: Ops.factor("select q.type,crit.Title, r.Value from criteria crit, reply r,question_reply qr, question q, question_criteria qc, form_question fq where qr.reply=r.ID and qr.question=q.ID and qc.question=q.ID and crit.ID=qc.criteria and fq.question=q.ID and fq.form=4 and crit.Title=",
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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