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mysql- 我想根据homework的ID 对homework_list的字段内容进行更新，怎么写

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Release： 2016-06-06 09:38:15
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mysqlsql

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mysql 的sql语句怎么写，包括homework_list 表删除数据，和添加数据

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其中添加数据是按照课程的id进行添加，，，，求大神告诉一下
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mysql sql
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