ORA-19206：Invalid value for query or REF CURSOR parameter
错误码
错误描述：Invalid value for query or REF CURSOR parameter
错误原因：The queryString argument passed to DBMS_XMLGEN.newContext was not a valid query, or REF CURSOR.
解决方法：Rewrite the query so that the queryString argument is a valid query or REF CURSOR.
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