我有以下数据帧data。我正在尝试使用ggplot创建折线图，其中有两条线(Date下的两个日期)，Key作为我的x轴，Value作为我的Y轴。
structure(list(Date = c("2020-11-01", "2020-11-28", "2020-11-01",
"2020-11-28", "2020-11-01", "2020-11-28", "2020-11-01", "2020-11-28",
"2020-11-01", "2020-11-28", "2020-11-01", "2020-11-28", "2020-11-01",
"2020-11-28"), Key = structure(c(1L, 1L, 2L, 2L, 3L, 3L, 4L,
4L, 5L, 5L, 6L, 6L, 7L, 7L), .Label = c("3M", "2YR", "5YR", "10YR",
"20YR", "25YR", "30YR"), class = "factor"), Value = c(3.6, 4.25,
4.22, 4.37, 7.09, 7.065, 9.315, 8.96, 11.65, 11.05, 11.77, 11.145,
11.73, 11.075)), row.names = c(NA, -14L), class = "data.frame")这是我在绘图中使用的代码。然而，它并没有像预期的那样出现(曲线没有出现在绘图上，添加了下面的图像)
ggplot(dat2, aes(x = Key, y = Value, col = Date)) +
geom_line()?
?
这就是我希望它看起来像这样
?
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