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Vlookup  up to find only empty cell in a column

Posted on 2014-07-18
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Last Modified: 2014-07-19
Hi experts excel 2010

How would you write a formula so if in column A cell 2 you have a data value and cell A3 is empty then in A3 then lookup applies but ignore all cells in column a where you already have a value..

So
Col A.          Col B.
Wcd.            Lookup return nothing
                     Here blank look finds value from look up table
Adds.           lookup returns nothing

Etc...
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Question by:route217
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4 Comments
 

Author Comment

by:route217
ID: 40205603
The formula has to apply to both text data and numerical data...
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LVL 27

Expert Comment

by:Glenn Ray
ID: 40205718
The formula would be something along this line (inserted in B2 and copied down):
=IF(A2<>"","",VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup]))

We may need to see a more-detailed example if this isn't helpful.

Regards,
-Glenn
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Author Comment

by:route217
ID: 40205917
Thanks Glenn excellent feedback.

If I amend formul to =if (isna (A2 <>"","", vlookup etc...would this work also..
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LVL 27

Accepted Solution

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Glenn Ray earned 2000 total points
ID: 40205924
I assume you want error handling for the VLOOKUP.  In that case the formula would be revised as follows:
=IF(A2<>"","",IFERROR(VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup]),"")

Since you have Excel 2010, the IFERROR function is a much better tool to handle #N/A values on VLOOKUPS.

-Glenn
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