[R] Passing arguments to SQL Query in R
R. Michael Weylandt
michael.weylandt at gmail.com
Thu Jul 26 16:22:52 CEST 2012
On Thu, Jul 26, 2012 at 3:59 AM, guruappa <guruappa at gmail.com> wrote:
> Hello all,
> I am a newbie at R, with some experience in PERL.
> I have a database table that contains the following data:
> Name | Score
> ======= | =====
> Sachin T | 25
> Sachin T | 53
> Sachin T | 57
> Sachin T | 34
> Rahul D | 38
> Rahul D | 31
> Rahul D | 53
> Ricky P | 7
> Ricky P | 45
> Ricky P | 27
> Ricky P | 17
> Ricky P | 86
> Ricky P | 48
> Jacques K | 23
> Jacques K | 86
> Jacques K | 32
> I want the summary data as below:
> Name | Avg Score
> Jacques K|47.00
> Rahul D|40.67
> Ricky P|38.33
> Sachin T|42.25
> Currently, I am trying to pass the name of the person as an argument in a
> sql query by breaking the query into parts, and then concatenating the query
> string. Of course, the scheme is not working.
> I want a query as below:
> SELECT NAME, SCORE FROM PLAYER_SCORE_TBL where NAME = ?
> Then I can pass the parameters like we do in PERL.
> If there is an alternative to the whole scheme, that would be wonderful. a
> way that would just take the whole table, and provide pivot table like
Many, but I'll give one:
with(DataFrameName, tapply(Score, Name, mean))
also aggregate(), ave(), and many others.
Off topic: you might look at the sqldf package to do sql-form queries
on R objects.
> Thanks in advance,
> Guruppa Padsali.
> View this message in context: http://r.789695.n4.nabble.com/Passing-arguments-to-SQL-Query-in-R-tp4637899.html
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> and provide commented, minimal, self-contained, reproducible code.
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