散列函数

说明：  数据库中的散列法是使用计算值来分配表格数据的方法，它比在整个索引中搜索要好的多。一个哈希散列答应你在数据库表格中存储数据，以便这些行的要害计算的相同值存储在相同的位置。 只有那种数据量超大的数据库才会用到
(Hashing in a database is a method of allocating tabular data using computed values, which is much better than searching in the entire index. A hash hash allows you to store data in the database table so that the same values for the key calculations of these rows are stored in the same location. Only the large amount of data will be used in Databases)