excel - Comparing, matching and combining columns of data -

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i need matching data , combining it. have 4 columns of data in excel sheet, similar following:

column:     1       2      3      4              u       3           0             w       6      b      0             r       1      c      0             t       9      d      0             ...     ...    ...    ...

column 2 data value corresponds letter in column one. need compare column 3 column 1 , whenever matches copy corresponding value column 2 column 4.

you might ask why don't manually ? have spreadsheet around 100,000 rows isn't option!

i have access matlab , have information imported, if more completed within environment, please let me know.

as mentioned @bla:

a formula similar =if(a1=c1,b1,0)

should serve (excel).


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