我有一个字符向量说
"a","b","c","d","e"
矢量的输出是
as.is data.frame指令选择我们将任何列作为纯文本阅读。这适用于select X, Y, Z, Period, Amount as TopAmount
from
(select X, Y, Z, Period, cast(StrAmt as double) as Amount,
row_number() over (partition by Period order by cast(StrAmt as double) desc) as TmpRank
from WTF
) TMPWTF
where TmpRank =1
。我可以使用as.is作为矢量吗？