计算列值的分布。

Calculate the distribution of column values.

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消息摘要（又称消息认证代码）是用散列函数计算的。

The message digest (also called the message authentication code) is computed using a hash function.

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我们原本还可以对最初的例子使用具有计算列的关系视图来实现这一点。

We could have done this with the original example also by using a relational view with computed columns.

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