这包括需要根据几个列中的值的组合选择行的查询。

This includes queries that involve selecting rows based on combinations of values in several columns.

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即它在一个唯一键组合上只会产生一行数据。

That is it only brings in one row of data for a unique key combination.

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取得对表格 ID、值对象类、数据行的会话属性和组合框（如果有的话）的会话属性的引用。

Obtains the reference for the table ID, value object class, session attribute for data rows, and session attribute for combo box if one exists.

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