不需要根据ID等唯一标识符去查找，只要一条sql语句要求返回所有的患者。

Instead of finding by a unique identifier like id, an SQL statement requests that all patients be returned.

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例如你要写一句赋值语句，你可以声明任何类型的变量，在等号的左边使用任何标识符，然后在右边给出任何的表达式。

In writing an assignment statement, for example, you can declare variables of any type, use any identifier to the left of the equal sign, and supply any expression on the right.

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行标识符(RID_BIT或RID)内置函数：该内置函数可用于SELECT列表或谓词语句。

Row identifier (RID_BIT or RID) built-in function: This built-in function can be used in the SELECT list or predicates statement.

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