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How's my Logic? Ascertain Number of unique items in column of data with VBA

Dear Experts.

My logical thinking seems to be very fuzzy.

I receive a spreadsheet of Account Customer data which varies month on month.

My VBA code needs to determine each month how many different Accounts are in the list and make a summary list.

I have come up with the  code in the attached sample spreadsheet, but I feel that I am over-complicating the issue. Can you help me by either suggesting something simpler, or by validating my approach?

I have attached a truncated file with just the relevant data included.

Thanks very much
David P.
EE-Count-Unique-Items.xlsm
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David Phelops
Asked:
David Phelops
4 Solutions
 
Rgonzo1971Commented:
Hi,

you could use the dictionary object

Sub macro()
Dim Dict As Object
Dim c As Range
Dim k As Variant, i As Variant
Dim N As Integer


Set Dict = CreateObject("Scripting.Dictionary")
For Each c In Range("A2", Range("A2").End(xlDown))
    If Not Dict.Exists(c.Value) Then Dict.Add c.Value, c.Offset(0, 2).Value
Next c
Rows("1:" & Dict.Count + 1 & "").Insert
k = Dict.keys
i = Dict.items
For N = 0 To Dict.Count - 1
    Range("A" & N + 1) = k(N) & " " & i(N)
Next N

End Sub

Open in new window

Regards
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aikimarkCommented:
You can also use the unique records feature to copy the unique values of a column to a range on the same or different worksheet.
Sheets("HSBC").Range("A1:A84").AdvancedFilter Action:=xlFilterCopy, _ 
       CopyToRange:=Range("Sheet1!A1"), Unique:=True

Open in new window

Here is a link to my webinar on Advanced Filters:
http://www.experts-exchange.com/VP_74.html
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Rob HensonFinance AnalystCommented:
Creating a Pivot Table on your data using the Account "Name" as a Row label would give you a list of unique names.

Using one of the various COUNT functions would then give you the number of unique items.

Thanks
Rob H
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Naresh PatelTraderCommented:
Hi dphelops,


I don't know what mi attaching is worth or not but what you are tying to do via code is also achieve by formula. see attached file.




Thanks
EE-Count-Unique-Items.xlsm
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David PhelopsAuthor Commented:
Thank you everyone who has replied. All your answers have been very helpful.

The one that comes closest is the Dictionary object from Rgonzo1971.  That has the merit of replicating exactly what I needed AND I've learnt a new thing about VBA!!

I considered the Advanced filter from aikimark; that, however does not count the number of Items needed to determine how many rows to insert to fit the items above the data.  That would be a useful second step - and quick and short code.  I like that.

Also considered the Pivot Table Route, from robhenson, but that would have to be created first. I need to count the items first, as mentioned above.

And itjockey - nice formula - thanks; two things
1. My own personal preference is to avoid putting complicated formulae in spreadsheets using  VBA, if possible.
2. Again, the formula would have to be put in first in order to  determine the unique item count.

I really appreciate your interest and help.
Thanks
David P.
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