Question

I’m using the sqldf package in R and am trying to find the count of values which are 1 and 2 in a single column. My data looks like:

> head(d)
       bid status
1  201-300      1
2  201-300      1
3 901-1000      2
4  601-700      1
5  801-900      1
6  801-900      2

I am trying to find the count of status when it’s equal to 1 and the count of status when it’s equal to 2, and then have them in two separate columns.

So using the sqldf package in R, I ran the following code:

sqldf("SELECT bid, SUM(IF(status='2', 1,0)) AS 'won', SUM(IF(status='1', 1,0)) AS 'lost', COUNT(bid) FROM d GROUP BY bid")

However, I get the following error message.

Error in sqliteExecStatement(con, statement, bind.data) : 
  RS-DBI driver: (error in statement: no such function: IF)

Is this not possible with the sqldf package?
Is there a way to get the desired results with another sql command in R? (or with plyr, reshape, or any other tool in R)

Answer 1

Since you said you could be interested in a plyr based solution, I can give that:

ddply(d, .(bid), summarise, won = sum(status==2), 
                            lost = sum(status==1), count = length(bid))