1: 列出所有数据 select * from m_data
2: 删除所有数据 delete from m_data
3: 列出某一栏目数据 select * from m_data where m_type =(select m_id from m_type where m_name = '频道1')
4: 删除某一栏目数据 delete from m_data where m_type =(select m_id from m_type where m_name = '频道1')
5: 列出某一专题的数据 select * from m_data where m_type =(select m_id from m_topic where m_name = '男人必看十部')
6: 删除 某一专题的数据 delete from m_data where m_type =(select m_id from m_topic where m_name = '男人必看十部')
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