Excel：如何根据来自不同列的值计算唯一值的总数

Question

I am trying to calculate total number of orders based on a referral indicator. In my table I have 3 columns.

order_id (a), sku (b), referral (c)
9073765908  19333476    EMP_BC
9073765908  18717916    EMP_BC
9073741228  23224786    EMP_BC
9073729088  15870816    EMP_BC
9073238838  15927306    EMP_BC
9073216258  23210836    EMP_BC
9073216258  18709096    EMP_BC
9073216258  18705756    EMP_BC
9073169568  19333496    EMP_BC
9073169168  18714626    EMP_BC
9072921778  22723516    EMP_ES
9072921778  18708696    EMP_ES
9072921778  15933746    EMP_ES
9072910758  23223526    EMP_BC
9072910758  23184416    EMP_BC
9072910758  21081716    EMP_BC
9072910758  18704496    EMP_BC
9072895968  21082646    EMP_ES
9072856628  28685906    EMP_BC
9072856628  23795646    EMP_BC
9072856628  21447106    EMP_BC
9072856628  15936966    EMP_BC   

Here is all the things I've tried thus far:

=COUNTIFS(C:C, "=EMP_BC")

However this returns total including the duplicates.

Also tried this:

=SUMPRODUCT(1/COUNTIFS(A:A, A:A, C:C, "=EMP_BC"))

This however, causes my excel to freeze... Im assuming this is due to the number of records I have... I have over 60K records.

[edit] I am expected the following result:

for EMP_BC: 8
because the following order_id is unique and the referral is EMP_BC:
9073765908
9073741228
9073729088
9073238838
9073216258
9073169568
9072910758
9072856628

I currently have a tab specifically setup so that it can have data copied and pasted in a tab. Another tab with all the formulas will reference the data and display the results. This one metric is giving me a lot of problems.

Any recommendations?

Answer 1

Here is an array formula that should accomplish what you want. To enter an array formula, hold down ctrl-shift while hitting enter . If you do this correctly, Excel will place braces {...} around the formula.

=SUM(IFERROR(1/COUNTIFS(order_id,order_id,referral,"EMP_BC"),0))

This formula assumes the ranges comprise just the used range, and not the entire column.

It is possible that a User Defined Function written in VBA will execute much faster, even with limited range references.

To enter this User Defined Function (UDF), alt-F11 opens the Visual Basic Editor. Ensure your project is highlighted in the Project Explorer window. Then, from the top menu, select Insert/Module and paste the code below into the window that opens.

To use this User Defined Function (UDF), enter a formula like =UniqueOrdersByReferral(order_id,referral,"EMP_BC") in some cell.

---

Option Explicit
Option Compare Text 'Comment out this line to make case SENSITIVE
Function UniqueOrdersByReferral(rOrderID As Range, rReferral As Range, sReferralCode As String) As Long
    Dim Col As Collection
    Dim I As Long, vOID As Variant, vREF As Variant

vOID = rOrderID
vREF = rReferral

If UBound(vOID) <> UBound(vREF) Then
    MsgBox "Order ID and Referral Ranges must be of same size"
    Exit Function
End If

Set Col = New Collection
On Error Resume Next
For I = 1 To UBound(vOID)
    If vREF(I, 1) = sReferralCode Then Col.Add vOID(I, 1), CStr(vOID(I, 1))
Next I
On Error GoTo 0

UniqueOrdersByReferral = Col.Count

End Function

---