Hi all
Pretty new to excel, and attempting to compare two columns of data to
find the common values.
e.g I have the following 2 columns of data
column1 column2
a b
b c
c e
d g
e x
f y
g z
what I am trying to do is from these 2 columns, determine whthe list of
1. Common values
2. Values that appear in column 1 but not in column 2
3. Values that appear in column 2 but not in column 1
The data is provided from a database. I tired using the 'IF' function
but I could not work out how to say "if the value of a column 1 cell
*is in the whole range* column 2".
Using The help section in excel, i could only work out how to do this
as the examples only compare one value against another, not against a
range.
any ideas?
thanks

Signature
patman
Dav - 25 Jul 2006 12:16 GMT
It depends how you want to display things countif(a:A,b1) would tell yo
how many times the value in cell b1 appears in column a, say in cell c1
It could be changed into an if statement
=if(countif(a:a,b1)>0,"Duplicate","Unique")
in d1
=if(countif(b:b,a1)>0,"Duplicate","Unique")
both these formulas could be copied down to all the rows and maybe the
filter by these values to select what you require
Regards
Da
Ken Johnson - 25 Jul 2006 15:05 GMT
Hi patman,
try these for 10,000 rows of data in columns A and B starting in row
2...
1. Common values...
=IF(COUNTIF($A$2:$A$10001,B2)>0,B2,"")
2. Values that appear in column 1 but not in column 2...
=IF(B2="","",IF(COUNTIF($B$2:$B$10001,A2)=0,A2,""))
3. Values that appear in column 2 but not in column 1...
=IF(A2="","",IF(COUNTIF($A$2:$A$10001,B2)=0,B2,""))
Fill down to suit and adjust 10001 if data is deeper.
Ken Johnson