validate duplicate entry in a column

G

Guest

would like error notification when a duplicate entry is made in a specific
column in excel worksheet can this be done with validation function ?
 
G

Guest

This works if you have entries in column A and check column B against it (
it will tell you in which row your duplicates are.
Put this in column C and fill down.

=IF(ISNA(MATCH(B1,A$1:A$8000,0)),"no match","ID is in Row: " &
MATCH(B1,A$1:A$8000,0))
 
G

Guest

the foumlua works.
but if i using cncatenate, it cant. any tips to further enchance?
 
G

Guest

i had seen that website long before.

it cant works if i using CONCATENATE formula in that column.
 

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