# comparing 2 columns

I have got a set of data returned from a query – exported to excel. I have 2 rows of data I need to “compare”, they are called invoice_num and invoice_ID. If a unique invoice_num appears in 20 consecutive rows – there should also be a unique invoice_ID which should also appear in the same 20 rows.
i.e.

invoice_num             invoice_id
12345                  34567
12345                  34567
12345                  34567
55555                  99999
55555                  99999
12348                  50006
12348                  50006

As it stands invoice_num is in column A and invoice_ID is in column B. I presume an additioanl column i.e. Z that has some sort of summary would be fine. An exception would be if you have unique invoice_num but different invoice_ID on different rows, and vice versa.
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Commented:
Not quite sure what you are asking for here. Can you give an example
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Commented:
Hi,

pls try

=IF(SUM(IF(FREQUENCY((\$A\$2:\$A\$8=A2)*(\$B\$2:\$B\$8),(\$A\$2:\$A\$8=A2)*(\$B\$2:\$B\$8))>0,1))-2+SUM(IF(FREQUENCY((\$B\$2:\$B\$8=B2)*(\$A\$2:\$A\$8),(\$B\$2:\$B\$8=B2)*(\$A\$2:\$A\$8))>0,1))-2,"Not OK","OK")

Regards
EE20140910.xlsx
0
Finance AnalystCommented:
Assuming data in columns A & B, the following formula in column C will give blank for first occurence of Invoice or TRUE or FALSE depending whether the Invoice ID matches the first occurence:

=IFERROR(B2=VLOOKUP(A2,\$A\$1:B1,2,FALSE),"")

Copy into C2 and then copy down. The lookup range will extend as you copy down. You can then filter for FALSE to get those that don't match.

Thanks
Rob H
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Commented:
If this is an ongoing requirement you could make a table out of the two columns and create two linked pivot tables, one with column A left-most row and one with column B left-most row ( in traditional pivot table format) and the abnormal combinations will visually stand out.
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