记录一下两种SQL代码报错场景，你有没有遇到过？
报错1：
SQL 错误 [1054] [42S22]: Unknown column ‘total_amt’ in ‘window order by’
报错2：
SQL 错误 [S1009]: No operations allowed after statement closed.
联想一下： case when
报错1：
SQL 错误 [1054] [42S22]: Unknown column ‘total_amt’ in ‘window order by’
报错2：
SQL 错误 [S1009]: No operations allowed after statement closed.
联想一下： case when