merge data frames (inner, outer, left, right)
数据
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> df1 = data.frame(CustomerId = c(1:6), Product = c(rep("Toaster", 3), rep("Radio", 3)))
> df1
> CustomerId Product
1 1 Toaster
2 2 Toaster
3 3 Toaster
4 4 Radio
5 5 Radio
6 6 Radio
> df2 = data.frame(CustomerId = c(2, 4, 6), State = c(rep("Alabama", 2), rep("Ohio", 1)))
> df
> CustomerId State
1 2 Alabama
2 4 Alabama
3 6 Ohio
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inner
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> merge(x = df1, y = df2, by = "CustomerId", all = TRUE)
> CustomerId Product State
1 1 Toaster <NA>
2 2 Toaster Alabama
3 3 Toaster <NA>
4 4 Radio Alabama
5 5 Radio <NA>
6 6 Radio Ohio
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left
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> merge(x = df1, y = df2, by = "CustomerId", all.x = TRUE)
> CustomerId Product State
1 1 Toaster <NA>
2 2 Toaster Alabama
3 3 Toaster <NA>
4 4 Radio Alabama
5 5 Radio <NA>
6 6 Radio Ohio
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right
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> merge(x = df1, y = df2, by = "CustomerId", all.y = TRUE)
> CustomerId Product State
1 2 Toaster Alabama
2 4 Radio Alabama
3 6 Radio Ohio
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outer
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> merge(x = df1, y = df2, by = NULL)
> CustomerId.x Product CustomerId.y State
1 1 Toaster 2 Alabama
2 2 Toaster 2 Alabama
3 3 Toaster 2 Alabama
4 4 Radio 2 Alabama
5 5 Radio 2 Alabama
6 6 Radio 2 Alabama
7 1 Toaster 4 Alabama
8 2 Toaster 4 Alabama
9 3 Toaster 4 Alabama
10 4 Radio 4 Alabama
11 5 Radio 4 Alabama
12 6 Radio 4 Alabama
13 1 Toaster 6 Ohio
14 2 Toaster 6 Ohio
15 3 Toaster 6 Ohio
16 4 Radio 6 Ohio
17 5 Radio 6 Ohio
18 6 Radio 6 Ohio
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原文链接：https://blog.csdn.net/asongsongsong/article/details/51029165