How can I extract only the information about the same group from the table information?

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Currently, I would like to extract only the information about the same group of tables.
For example, in a table named A
1 3 2
1 4 5
1 5 6
1 6 8
2 3 7
2 5 3
2 7 4
3 9 6
3 4 2
I want to extract the information about the group [1,2,3] for the first column.
  4 Comments
dpb
dpb on 18 Jan 2021
Actually, rereading the Q? and looking at the data more closely, I'm guessing what OP is looking for is grouping variables.
Depending upon just what is meant by "table" here, rowfun, varfun or findgroups, splitapply are likely what is really wanted/need.

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