搜身;
There are many kinds of database index, such as B+-tree, AVL tree and SB-tree, which are built now, but through which we could not to search data on many keys.
目前数据库索引方法比较多,包括B+-树、AVL树和SB-树等,但都不能很好地解决数据库的多键值查询问题。
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