[R] query in R

[Dong H. Oh]

sqlQuery() function in RODBC library will be helpful.


Sincerely,

On Nov 15, 2006, at 1:33 AM, Jens Scheidtmann wrote:

> Xiaodong Jin <close2ceo at yahoo.com> writes:
>
>> how to realize the following SQL command in R?
>>
>>   select distinct A, B, count(C)
>>   from TABLE
>>   group by A, B
>>   ;
>>   quit;
>
> The functional equivalent of is statement in R on a dataframe is:
>
> TABLE$ones <- 1;
> aggregate(TABLE$ones, list(TABLE$a, TABLE$b), sum);
>
> HTH,
>
> Jens
>
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>

===========================================
Dong H. Oh

Ph. D Candidate
Techno-Economics and Policy Program
College of Engineering, Seoul National University,
Seoul, 151-050, Republic of Korea

E-mail:doriaba2 at snu.ac.kr
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