how to extract unique list from two columns

I have column A in sheet1 and Column A in Sheet2

in sheet3 Column A i want to list unique list of all values that exists in Sheet1 ColA and Sheet2 ColA

please see attached.
EE.xlsx
LVL 3
excelismagicAsked:
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ShumsDistinguished Expert - 2017Commented:
Create two named range list with below formula:
List1
=OFFSET(Sheet1!$A$1,0,0,COUNTA(Sheet1!$A:$A))

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List2
=OFFSET(Sheet2!$A$1,0,0,COUNTA(Sheet2!$A:$A))

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In Sheet3 B2 enter below Array Formula, confirmed with Ctrl+Shift+Enter:
=IFERROR(IFERROR(INDEX(List1,MATCH(0,COUNTIF($B$1:B1,List1),0)),INDEX(List2,MATCH(0,COUNTIF($B$1:B1,List2),0))),"")

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EE_3.xlsx
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excelismagicAuthor Commented:
thanks Shams
but there is one problem with the solution. why should i have an empty row above sheet3? cannot i have it the way i portrayed it?
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excelismagicAuthor Commented:
COLUMNA is not a value it is a header
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ShumsDistinguished Expert - 2017Commented:
Corrected....
EE_4.xlsx
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excelismagicAuthor Commented:
sorry both of the answers are incorrect. when i drag down the formula it also lists the values that are not in common.
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excelismagicAuthor Commented:
if you drag your formula down, why does it list the values that are not common between both columns?
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ShumsDistinguished Expert - 2017Commented:
Have checked in corrected sheet?
EE_4.xlsx
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ProfessorJimJamMicrosoft Excel ExpertCommented:
try this one when you want to list only those values that are common between two columns 

=IFERROR(INDEX(List1, SMALL(IF(COUNTIF(List2, List1), MATCH(ROW(List1),ROW(List1)), ""), ROWS($A$1:A1))),"")

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ShumsDistinguished Expert - 2017Commented:
The corrected method:
List1 NamedRange Formula:
=OFFSET(Sheet1!$A$2, 0, 0, COUNTA(Sheet1!$A$2:$A$1001))

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List2 NamedRange Formula:
=OFFSET(Sheet2!$A$2, 0, 0, COUNTA(Sheet2!$A$2:$A$1001))

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Array Formula for Unique List for both the list:
=IFERROR(IFERROR(INDEX(List1,MATCH(0,COUNTIF($B$1:B1,List1),0)),INDEX(List2,MATCH(0,COUNTIF($B$1:B1,List2),0))),"")

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Please find attached....where I have checker formula to check unique list. which is 42 in your case...
EE_Unique-list-multiple-Sheets.xlsx
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