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Excel vlookup problem

Posted on 2012-03-17
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Last Modified: 2012-03-18
In the attached spreadsheet, I cannot understand why it does what it does.  How can D1 - D10 be #N/A, but then D11 - D20 yield that result?  It all makes no sense, even in this cheesy-easy example.  I made this simple test case because in my big complicated spreadsheet it wasn't working either
Book3.xls
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Question by:johnsonsite
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ltsweb earned 500 total points
ID: 37733527
You should use: =VLOOKUP(A1|$B$1:$C$20|2|FALSE)

It populated the answer "T" instead of "N/A"

The reason is False will do an exact match which sounds counter intuitive, but it works!

Hope that helps!
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Author Comment

by:johnsonsite
ID: 37733618
Yes, not intuitive. All the web searching I did (hours worth) never exposed that trick.  It really should work fine the other way too, with TRUE (the default).  Stupid Microsoft.

Anyway, thanks a lot!
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Expert Comment

by:barry houdini
ID: 37733703
Sometimes Excel help is the best place to look. My version says this about the final (4th) argument:

range_lookup    Optional. A logical value that specifies whether you want VLOOKUP to find an exact match or an approximate match:

If range_lookup is either TRUE or is omitted, an exact or approximate match is returned. If an exact match is not found, the next largest value that is less than lookup_value is returned.

Important   If range_lookup is either TRUE or is omitted, the values in the first column of table_array must be placed in ascending sort order; otherwise, VLOOKUP might not return the correct value.


Note that last part, TRUE will only work when the lookup array is sorted ascending - yours is sorted descending, hence #N/A results.

regards, barry
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Author Comment

by:johnsonsite
ID: 37733838
Well, that was a bad example I sent out then. In my real spreadsheet the values are ascending. Either way, adding the FALSE parameter cured the problem, although it doesn't make sense.  If a match is an exact match, then it would ALSO satisfy being a partial match. The function just doesn't even work if the range_lookup is TRUE or omitted, it returns mostly garbage.

Thank you!
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