# Unique List From 2 Columns

#### Richard_at_Excelpers

##### New Member
...if you have column headings, you may need to use...
=IF(COUNTIF(B:B,A=0,A2,"")

Basically, this will only show values in Column C if they don't appear in Col C.

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Get help while writing formula
Click the italics "fx" icon to the left of the formula bar to open the Functions Arguments dialog. Help is displayed for each argument.

#### kvsrinivasamurthy

##### Well-known Member
 A B C D 32 11 11 45 12 34 12 34 51 51 51 32

<tbody>
</tbody>
Column A data A2:A5
Column B data B2:B7
ARRAY Formula in D2 then copied down

Code:
``=IFERROR(INDEX(\$B:\$B,SMALL(IF((COUNTIF(\$D\$1:\$D1,\$B\$2:\$B\$7)=0)*COUNTIF(\$A\$2:\$A\$4,\$B\$2:\$B\$7)=0),ROW(\$B\$2:\$B\$7),""),ROWS(\$D\$2:\$D2))),"")``
How ARRAY formula is entered

Paste Formula in the cell.
Press F2
Hold Shift+ Ctrl Keys and hit Enter key.
Now the formula is surrounded by {} by excel.

Last edited:

#### kvsrinivasamurthy

##### Well-known Member
Formula given in previous post does not work properly.
Here is the revised formula.

Code:
``=IFERROR(INDEX(\$B:\$B,SMALL(IF((COUNTIF(\$D\$1:\$D1,\$B\$2:\$B\$7)=0)*COUNTIF(\$A\$2:\$A\$4,\$B\$2:\$B\$7)=0),ROW(\$B\$2:\$B\$7),""),1)),"")``

#### kvsrinivasamurthy

##### Well-known Member
If numbers in both list are required.

 A B C D 32 11 11 45 12 34 12 34 51 51 45 51 32

<colgroup><col width="64" span="4" style="width:48pt"> </colgroup><tbody>
</tbody>
ARRAY formula in D2

Code:
``=IFERROR(INDEX(\$B:\$B,SMALL(IF((COUNTIF(\$D\$1:\$D1,\$B\$2:\$B\$7)=0)*(COUNTIF(\$A\$2:\$A\$4,\$B\$2:\$B\$7)=0),ROW(\$B\$2:\$B\$7),""),1)),IFERROR(INDEX(\$A:\$A,SMALL(IF((COUNTIF(\$D\$1:\$D1,\$A\$2:\$A\$4)=0)*(COUNTIF(\$B\$2:\$B\$7,\$A\$2:\$A\$4)=0),ROW(\$A\$2:\$A\$4),""),1)),""))``

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