How to plot a histogram after grouping the same values?

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수환 김
수환 김 2021-11-30
评论： Hiro Yoshino 2021-11-30
I have 2 rows.
id diff = 10 x 2 table
Var2 Var6
1 100
1 123
2 234
2 456
2 132
2 354
3 153
4 456
4 123
4 125
I want to draw a histogram by grouping 'Var2'.
According to the example above, there are 4 'Var2'. Therefore, there should be 4 histograms.
The code above is the code I used as an example.
Actually, in my data, there are 1 to 144 'Var2' and the number of 'Var6' is random. How do I plot a histogram for 144?

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