目录DESCRIBE语句SHOW pythonTABLE STATUS语句SHOW CREATE VIEW语句查看视图是指查看数据库中，已经存在的视图的定义查看视图，必须要有SHOW VIEW的权限查看视图有三种方式
Is it a good practise to use custom business exceptions (e.g. BusinessRuleViolationException) to control the flow of user-errors/user-incorrect-inputs???
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