=countifs(B1:B2,"산",A1:A4,"20191001")
원하는 날짜에 해당하는 항목값의 갯수 추출하기
참조..
https://englishcoffeeonline.tistory.com/49?category=766333
https://kiyoo.tistory.com/628?category=573088
https://xlworks.net/findingvalue_using_indexmatch/
https://xlworks.net/excel-vlookup-hlookup/
https://memorist.tistory.com/395