Mysql查询语句优化问题

【Mysql查询语句优化问题】

Mysql查询语句优化问题

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Mysql查询优化问题Mysql查询优化问题介绍:select ` c `.` order _ id ` as ` id `, count(` c `.` id `) as ` total amount `, count((case when(` c `.` send status `=