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Kim Jinung
MySQL - Count() 함수 다중 필드 본문
https://dba.stackexchange.com/questions/127564/how-to-use-count-with-multiple-columns
How to use COUNT with multiple columns?
How to use multiple columns with a single COUNT? Assume that there is a table demo with these data: id | col1 | col2 | -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* 1 |'alice' | 'book1'| 2 ...
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