2008-08-29 10:43:16 / Oracle入门与认证
To be callable from a SQL expression, a user-defined function must do what?A. Be stored only in the database.B. Have both IN and OUT parameters.C. Use the positional notation for parameters.D. Return a BOOLEAN or VARCHAR2 data type.该题目的正确答案应该是A还是C? 请同时说明理由.本人感觉A和C都是正确的,不知道选择哪一个.
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