Mysql中筆試問題解決

一、問題提出 1、表結構rru如下     2、要求查詢顯示結果爲    二、問題解決 　　　方式一： 　　　　　SELECT DISTINCT c.`year` AS YEAR, (SELECT amcount FROM product WHERE YEAR= c.`YEAR`  AND  MONTH = "1"  )AS m1, (SELECT amcount FROM product WHE

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