Mikkel Grum wrote:
Dear R-helpers,
I ran the following little test on RSQLite and got the
data below from the query. Unless I've made some
mistake, the results of both the where and order by
statements have problems:
This is due to the fact that SQLite as of version 2.8 is typeless
and values are stored as ASCII strings. Most expressions are evaluated
as string expressions, as in your query. For details see
http://www.sqlite.org/datatypes.html (SQLite Version 2.8) and
http://www.sqlite.org/datatype3.html (Version 3.0).
You can use a trivial arithmetic expression to force numeric
comparisons (awk users may recognize this trick):
dbGetQuery(con,
paste(select * from arrests where Rape+0.0 30,
order by Murder+0.0))
row_names Murder Assault UrbanPop Rape
1 Colorado7.9 204 78 38.7
2Arizona8.1 294 80 31.0
3 California9.0 276 91 40.6
4 Alaska 10.0 263 48 44.5
5 New Mexico 11.4 285 70 32.1
6 Michigan 12.1 255 74 35.1
7 Nevada 12.2 252 81 46.0
8Florida 15.4 335 80 31.9
Regards,
--
David
library(RSQLite)
con-dbConnect(dbDriver(SQLite),dbname=test)
data(USArrests)
dbWriteTable(con,arrests,USArrests,overwrite=TRUE)
dbListTables(con)
dbReadTable(con,arrests)
dbGetQuery(con,paste(SELECT row_names,Murder,Rape
FROM arrests,
WHERE Rape30 ORDER BY Murder))
row_names Murder Rape
1 Alaska 10.0 44.5
2 New Mexico 11.4 32.1
3 Michigan 12.1 35.1
4 Nevada 12.2 46.0
5Florida 15.4 31.9
6 North Dakota0.8 7.3
7 New Hampshire2.1 9.5
8 Maine2.1 7.8
9 Rhode Island3.4 8.3
10 West Virginia5.7 9.3
11 Colorado7.9 38.7
12 Arizona8.1 31.0
13California9.0 40.6
I'm running R 2.0.0 on Windows XP. Should I make a
bug report or can someone point to an error that I've
made?
cheers
Mikkel
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