MS Access: How can I count duplicate rows?

My table looks like this...

PersonID    Data1    Data2
1           XXXX     YYYY
1           BBBB     YYYY
2           BBBB     YYYY
3           XXXX     YYYY

I'd like it to look like this...

PersonID    SubRank    Data1    Data2
1           1          XXXX     YYYY
1 开发者_Python百科          2          BBBB     YYYY
2           1          BBBB     YYYY
3           1          XXXX     YYYY

The closest solution I've come up with looks like this... (ID is the database access unique ID)

SELECT TABLE.PersonID, DCount("ID","Table","(PersonID='"&[PersonID]&"')",) AS SubRank, Table.Data1, Table.Data2
FROM Table
ORDER BY Table.PersonID;

But that only returns the total value for the the unique rows (i.e. Subrank is "2" both times for PersonID #1). Eventually this query will feed a crosstab query to get all the data for a single personID onto one row.

I grabbed the solution above from here: http://www.ozgrid.com/forum/showthread.php?t=39231&page=1

I'd like to accomplish the same goal, however, their code just isn't working.

Thanks!

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You need to narrow the domain. You can see in the solution that he has

and 
(Date <= #" & [Date] & "#)")

inside of the dcount function. So you need to do something like that as well -- though I'd imagine you're going to use ID instead of date. Maybe something like this:

DCount("ID","Table","(PersonID='"&[PersonID]&"') and (PersonID <= " & [PersonID] & ")" )

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Your goal is a little vague here. Do you want to find the count of duplicates? Do you want to un-duplicate? Why not do this:

SELECT count(*), Data1, Data2 FROM Table GROUP BY Data1, Data2