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並前往https://www.bennadel.com/blog/3951-using-count-countcolumn-and-countexpression-variations-to-extract-row-metadata-in-mysql-5-7-32.htm

Using COUNT(), COUNT(column), And COUNT ... - Ben Nadel

Four COUNT() variations being used in a single MySQL 5.7 SQL query. ... SUM( IF( value IN ( 1, 2 ), value, NULL ) ) AS sum_expression.

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