我想发表以下声明:
SELECT fieldA, fieldB
FROM tableA
WHERE fielb != 'cond' GROUP BY fieldA.
此语句适用于SQLite Manager,但不适用于RSQLite。
请你帮助我好吗?
非常感谢 :)
对我来说,!=
工作正常。这是一个例子:
data(USArrests)
library(RSQLite)
m <- dbDriver("SQLite")
tfile <- tempfile()
con <- dbConnect(m, dbname = tfile)
dbWriteTable(con, "USArrests", USArrests)
rs <- dbSendQuery(con, "select * from USArrests where row_names != 'Alaska'")
d <- fetch(rs, n = -1) # extract all remaining data
setdiff(row.names(USArrests), d$row_names)
# [1] "Alaska"
dbHasCompleted(rs)
dbClearResult(rs)
dbListTables(con)
dbDisconnect(con)
file.remove(tfile)