PLS-00222：no function with name 'string' exists in this scope
错误码
错误描述：no function with name 'string' exists in this scope
错误原因：An identifier being referenced as a function was not declared or actually represents another object (for example, it might have been declared as a procedure).
解决方法：Check the spelling and declaration of the identifier. Also confirm that the declaration is placed correctly in the block structure.
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