MS Access query running counter

Hi

I need to add a running counter to a query that recites every time the value in a specific field changes.  The output would look like this

Value    Counter
Red        1
Red        2
Red        3
Blue       1
Blue       2
Yellow    1

etc...

How would I do this?

Many thanks
kenabbottAsked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
What about if Red comes back? Do you want the next value to be 4 or 1?
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
And do you have an autonumber ID field (as you are going to need it)?
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kenabbottAuthor Commented:
The colour column will be sorted so Red won't come back.  And yes there is an autonumber field
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
Assuming you have an ID column, and it is called Table1, here is the SQL code:

SELECT t.ID, t.Value, Count(u.ID) AS CountOfID
FROM Table1 AS t INNER JOIN Table1 AS u ON (t.Value = u.Value) AND (t.ID >= u.ID)
GROUP BY t.ID, t.Value;

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Mike EghtebasDatabase and Application DeveloperCommented:
SELECT  t.Value,
  (
    Select Count(*) From Table1 tt
    Where t.ID < tt.ID and  t.Value = tt.Value
  )+1 AS Count
FROM Table1 t
ORDER BY t.Value



If you enter a new colors or exiting colors out of order, this query still works.

Mike
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