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图片-mysql分段数据统计sql怎么写

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Release： 2016-06-06 09:35:31
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mysql图片数据

图片说明，
1.
这是一张班级的成绩表，想统计出每个成绩段的数据，mysql的sql语句该怎么写呢。
图片说明

Related labels：
mysql 图片 数据
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