=if(countif(a2:k2,"a")=0,,countif(a2:k2,"a")&"a")&if(countif(a2:k2,"b")=0,,countif(a2:k2,"b")&"b")&if(countif(a2:k2,"c")=0,,countif(a2:k2,"c")&"c")&if(countif(a2:k2,"d")=0,,countif(a2:k2,"d")&"d")
这种方法如果没有a时,就不显示a,(而不是显示0a)。即,abcd有就显示有几个,没有,就不显示。
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