PLS-00525：Within SQL statements, only equality comparisons of objects are allowed without a map or order function.
错误码
错误描述：Within SQL statements, only equality comparisons of objects are allowed without a map or order function.
错误原因：A map or order function was not provided for a relational comparison. Only equality comparisons may be used when a map or order function is not supplied.
解决方法：Supply either a map or order function for the object. Otherwise change the program to use only equality comparisons.
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