The use of these specific columns ensures that the related column values are not inadvertently set to NULL.

这些特定列的使用能够确保相关的列值不会意外设置为NULL。

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Each return row call adds a new row into the returned result set where column values are the current values of the result set column names.

每个RETURN ROW调用向返回的结果集增添一个新行，该结果集中的列值为结果集列名的当前值。

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Each time you use such a function or test, the data set must be sorted by the counted column before the occurrences of the values can be counted.

每次使用函数或者测试时，必须依照所计数列对数据集进行排序。

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