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

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。

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

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。

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When you call the odbc_exec function for a SELECT statement, the function returns a result set identifier.

当您为select语句调用odbc_exec函数时，该函数返回一个结果集标识符。

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