在Excel中的多个条件上查找多个值

Question

I am working in excel 2013. I have a table called data.

color   letter   number
red     a        1 
red     b        2 
blue    a        1
blue    a        1
blue    b        1
blue    a        2
blue    a        2

I want to look up [number] for all rows where [color]=blue and [letter]=a, so the rows I highlighted above.

=IFERROR(INDEX(data[number],AGGREGATE(15,6,ROW(data[#All])/((data[color]="blue")*(data[letter]="a")), ROW(1:1))), "")

This code gives me all [number] that are "blue" and "a", and currently returns

number
1
1
2
2

How do I get it to return this instead:

table
1
2

Answer 1

As an array formula,

=IFERROR(INDEX(Data[number], MATCH(0, IF(Data[color]="blue", IF(Data[letter]="a", COUNTIF(G$2:G2, Data[number]), 1), 1), 0)), "")