# Creating an item sequence by account number

I have a table that contains the detail records of an account. Each account can have up to 99 pieces of equipment associated with it. The table contain 125,000 records. I need to create a sequence number of reach item within the account. If I have 83 items and my account number is 123456, then I need to number the items from 1 to 83. If the next account, 123457, has 28 items, I need to number them 1 to 28. And so on. . .

What is the best method to create such sequencing in an existing data table?
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Commented:
Exactly...  and also change the <= to simply <.  My example above starts at 1 (so adding 900 would be 901 as a starting point).  If you use  < for the comparison, the count will start at 0 (900 if you add 900)

Try this:

Select a.*, (SELECT Count(b.ID) + 900 FROM YourTable b WHERE b.ID < a.ID AND b.[AccountNumber] = a.[AccountNumber]) AS [SequenceByAccountNumber]
FROM YourTable a
ORDER BY a.[AccountNumber],  a.ID
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Commented:
Are you doing this to display item number/sequence on forms and reports?

I'd do this by query rather than storing the item number in the table.

If you have an autonumber field in your table (assuming here that it is called ID), you can query the data with a sequence number like this:

Select a.*, (SELECT Count(b.ID) FROM YourTable b WHERE b.ID <= a.ID AND b.[AccountNumber] = a.[AccountNumber]) AS [SequenceByAccountNumber]
FROM YourTable a
ORDER BY a.[AccountNumber],  a.ID

You can also convert that to an UPDATE query by right-clicking the query window, selecting Query Type --> Update Query if you really need to store the sequence... but I would simply get it in a query like this on the fly, and display it when needed.
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Author Commented:
Sounds like a great way to do it. I will try it an see how it works. One additional caveat is that I need to start the sequence at 900. I presume I can just factor that in the query by adding 900 to the result. Would you agree?
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Author Commented:
Thanks mbizuo! Great solution.
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Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for ergenbgr's comment #a39680796

for the following reason:

Simple, yet effective, solution.
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Author Commented:
Simple, but effective. My kind of solution.
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