如果where子句不存在，效果是删除表中所有行。
If the WHERE clause is absent, the effect is to delete all rows in the table.
运行示例delete语句，模拟删除两个表中所有行的错误的应用程序逻辑。
Run sample delete statements to reproduce the bad application logic that deleted all rows in two tables.
运行示例delete语句，模拟删除两个表中所有行的错误的应用程序逻辑。
Run sample delete statements to reproduce the bad application logic that deleted all rows in two tables.
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