摘要:
Cast(字段名 as 转换的类型),其中类型可以为: BINARY[(N)]CHAR[(N)]DATEDATETIMEDECIMAL[(M[,D])]SIGNED [INTEGER]TIMEUNSIGNED [INTEGER] 用法: SELECT CAST(ctime AS char) as n 阅读全文
摘要:
.na.drop("all", Seq("create_time")) 阅读全文
摘要:
i <- 3 assign(paste0('myVar', i), 1:5) myVar3 ## [1] 1 2 3 4 5 更多:https://bbs.pinggu.org/thread-6853714-1-1.html 阅读全文