问题描述：要求一个语句从study，DICT 表中取出如表三所列格式数据

study表

DICT表

表三

答案：SQL：

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SELECT Deptname,
MAX(CASE WHEN Mon = '一月份' THEN value ELSE null END) AS 一月份,
MAX(CASE WHEN Mon = '二月份' THEN value ELSE null END) AS 二月份,
MAX(CASE WHEN Mon = '三月份' THEN value ELSE null END) AS 三月份
  FROM `study` as a right join `DICT` as b on a.dept=b.Dept group by Deptname

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