Spotfire : Syntax issue or Window functions not allowed?

问题

I am using Data functions in Spotfire. I have the sqldf package installed. Here is the query:

#Package to run sqls
library(sqldf)
#Input data frame
op1 <- sqldf("SELECT Prod_parnt,prodct_grop,year,month,week,
count(distinct id) as prd_cnt,
Sum(Count(distinct id))
over (partition by modlty,prodct_grop order by year,month,week
rows between 12 preceding and current row) as cumu_prd_cnt,
avg(rate) as sal_rate
FROM ip1
group by Prod_parnt,prodct_grop,year,month,week")

The error I am facing:

"TIBCO Spotfire Statistics Services returned an error: 'Error: error in statement: near "(": syntax error'."

Now the point to note here is that when I remove the Window function statement i.e cumu_prd_cnt field; the code works fine.

Need your help.

来源：https://stackoverflow.com/questions/38477963/spotfire-syntax-issue-or-window-functions-not-allowed