# Help match data using LOOKUP

#### Sean15

##### Well-known Member
Hi,
I saw this post here Any clever solutions to speed up a 50,000 row MATCH formula? and I find it useful. I didn't want to piggyback so I've opened a new thread. I'm getting some odd results using my data. The concept is still the same. I'm trying to find data in column B not in column A. I've sorted column A in ascending order. Why is formula in C7 and C8 returning #NA and not N?

Book1
ABC
1Blacksmith WJane WN
2Jane Tpaul SN
3Judith HSam WN
4paul VJudith H
5Pepper SSalt Y
6Salt YPepperN
7Sam XBlacksmith#N/A
8Beth#N/A
9RockN
10DsoldierN
11catN
12paul V
13pepper S
14#N/A
15#N/A
16#N/A
Sheet1
Cell Formulas
RangeFormula
C1:C16C1=IF(LOOKUP(B1,A:A)=B1,"","N")

### Excel Facts

Whats the difference between CONCAT and CONCATENATE?
The newer CONCAT function can reference a range of cells. =CONCATENATE(A1,A2,A3,A4,A5) becomes =CONCAT(A1:A5)

#### Fluff

##### MrExcel MVP, Moderator
If you drop column A down one cell & put an "a" in A1, you should be ok, as long as none of the values in col b start with a number.

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