Sumif and if duplicate only count onw

[ivanchun]

Hi All,

Just trying to use the sumif or other possible formula to count the numbers of the COL 1 hostname, however there are some duplicate hostname occur and i only want to count as 1. the expected result as Col B, any advice appreciate

Col A Col B
Hostname Number of Host
Hostname 1 5
Hostname 1
Hostname 1
Hostname 2
Hostname 3
Hostname 3
Hostname 3
Hostname 3
Hostname 4
Hostname 5
Hostname 5

[AliGW]

Administrative Note:

Welcome to the forum.

Is your forum profile showing the Excel PRODUCT that you need this to work for?

Members will tailor the solutions they offer to the Office PRODUCT (Excel, NOT Windows) that you have. Please check that your forum profile is up-to-date in this respect. If you aren't sure, in Excel go to File | Account and report what it says below the MS logo at the top of that page. If your product is for Mac, please also state this.

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Thanks.

[AliGW]

For 2021 & 365:

=COUNTA(UNIQUE(A2:A12))

For 2019 and earlier:

=SUMPRODUCT(1/COUNTIF(A2:A12,A2:A12))

**Array formulas are not entered in the same way as 'standard' formulas. Instead of pressing just ENTER, you first hold down CTRL and SHIFT, and only then press ENTER. If you've done it correctly, you'll notice Excel puts curly brackets {} around the formula (though do not attempt to manually insert these yourself).

[AliGW]

If you want to count a list that may have blanks:

=COUNTA(UNIQUE(TOCOL(A:A,1)))

or:

=SUMPRODUCT(1/COUNTIF(A:A,A:A&""))-1

array entered.

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[AliGW]

Seen - gone - no reply, not even a 'thank you'.

If that takes care of your original question, please choose Thread Tools from the menu link above and mark this thread as SOLVED. You can also access the SOLVED tag by editing the opening post and choosing SOLVED from the drop-down to the left of the title box.

Also, if you have not already done so, remember that you can reward anyone who offered you help towards a solution for your issue by clicking the small star icon (* Add Reputation) located in the lower left corner of the post in which the help was given. By doing so you can add to the reputation(s) of each of those who offered help.