ORA-30344：number of child cols different from number of parent level cols
错误码
错误描述：number of child cols different from number of parent level cols
错误原因：The number of child columns specified in a JOIN KEY clause is not the same as the number of columns in the specified parent level.
解决方法：Check the child columns and the columns in the definition of the referenced parent level and correct the discrepency.
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