计算 Excel 列中的唯一值 [英] Count unique values in a column in Excel

问题描述

我有一个 .xls 文件，其中有一列包含一些数据.如何计算包含此列的唯一值的数量?

I have an .xls file with a column with some data. How do I count how many unique values contains this column?

我在谷歌上搜索了很多选项，但他们在那里给出的公式总是给我错误.例如，

I have googled many options, but the formulas they give there always give me errors. For example,

=INDEX(List, MATCH(MIN(IF(COUNTIF($B$1:B1, List)=0, 1, MAX((COUNTIF(List, "<"&List)+1)*2))*(COUNTIF(List, "<"&List)+1)), COUNTIF(List, "<"&List)+1, 0))

返回

推荐答案

要计算 A2:A100 中不同值的数量(不计算空格):

To count the number of different values in A2:A100 (not counting blanks):

=SUMPRODUCT((A2:A100<>"")/COUNTIF(A2:A100,A2:A100&""))

从@Ulli Schmid 的回答复制到 这个 COUNTIF() 公式在做什么?:

Copied from an answer by @Ulli Schmid to What is this COUNTIF() formula doing?:

=SUMPRODUCT((A1:A100<>"")/COUNTIF(A1:A100,A1:A100&""))

计算 A1:A100 内的唯一单元格，排除空白单元格和带有空字符串 ("") 的单元格.

Counts unique cells within A1:A100, excluding blank cells and ones with an empty string ("").

它是怎么做到的?示例:

How does it do that? Example:

A1:A100 = [1, 1, 2, "apple", "peach", "apple", "", "", -, -, -, ...]
then:
A1:A100&"" = ["1", "1", "2", "apple", "peach", "apple", "", "", "", "", "", ...]

所以需要这个 &"" 将空白单元格 (-) 转换为空字符串 ("").如果您要直接使用空白单元格进行计数，则 COUNTIF() 返回 0.使用该技巧，"" 和 - 都被视为相同:

so this &"" is needed to turn blank cells (-) into empty strings (""). If you were to count directly using blank cells, COUNTIF() returns 0. Using the trick, both "" and - are counted as the same:

COUNTIF(A1:A100,A1:A100) = [2, 2, 1, 2, 1, 2, 94, 94, 0, 0, 0, ...]
but:
COUNTIF(A1:A100,A1:A100&"") = [2, 2, 1, 2, 1, 2, 94, 94, 94, 94, 94, ...]

如果我们现在想要获得所有唯一单元格的数量，不包括空格和"，我们可以进行除法

If we now want to get the count of all unique cells, excluding blanks and "", we can divide

(A1:A100<>""), which is [1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, ...]

通过我们的中间结果 COUNTIF(A1:A100,A1:A100&"")，并对值求和.

by our intermediate result, COUNTIF(A1:A100,A1:A100&""), and sum up over the values.

SUMPRODUCT((A1:A100<>"")/COUNTIF(A1:A100,A1:A100&""))  
= (1/2 + 1/2 + 1/1 + 1/2 + 1/1 + 1/2 + 0/94 + 0/94 + 0/94 + 0/94 + 0/94 + ...)
= 4

如果我们使用 COUNTIF(A1:A100,A1:A100) 而不是 COUNTIF(A1:A100,A1:A100&"")，那么其中一些0/94 本来就是 ​​0/0.由于不允许除以零，我们会抛出错误.

Had we used COUNTIF(A1:A100,A1:A100) instead of COUNTIF(A1:A100,A1:A100&""), then some of those 0/94 would have been 0/0. As division by zero is not allowed, we would have thrown an error.

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