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数据结构大致如下
id name book
1 save [book1,book2]
2 save [book3]
3 tony [book1]
....
简单说一下背景和需求
背景：用户借书(永远不会重复看书)，每借一次就记录一条数据，每次可以借一条或者多条
需求：统计每月中借书最多的排名
save [book1,book2,book3]
tony [book1]
...
id name book
1 save [book1,book2]
2 save [book3]
3 tony [book1]
....
简单说一下背景和需求
背景：用户借书(永远不会重复看书)，每借一次就记录一条数据，每次可以借一条或者多条
需求：统计每月中借书最多的排名
save [book1,book2,book3]
tony [book1]
...
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