Question

This is how my data looks like:

C1  C2  C3
1   1   a
2   2   a
3   3   a
4   4   a
7   5   a
8   6   a
9   7   a
10  8   a
    9   a
    10  b

You see that C1 is a subset of column C2. I want now to extract only the data from C2 – together with the corresponding value from C3 – that matches C1. The extracted data just needs to be copied to another column

Could someone give me a hand?

Answer 1

Assuming your data in C1 starts from A2, do the following:

1. Type in cell D2 (column C4): =IFERROR(VLOOKUP($A2,$B:$C,1,0),"")
2. Type in cell E2 (column C5): =IFERROR(VLOOKUP($A2,$B:$C,2,0),"")
3. Autofill both formulas.

This will give you what you want, missing values will be shown as blanks. If you want concatenate both parts of out – just put the aggregate formula =ISERROR(...)&ISERROR(...) to any column row 2 you like.

Sample file: https://www.dropbox.com/s/qglyxmu3tkfxy7g/DataExtract2Cols.xlsx