可以说，由于现实中的 RDBMS 常常包含需要保留的数据，仅仅删除模式然后通过 DDL 语句重新构建模式不是 正确的选择。
Suffice it to say that because a real-world RDBMS frequently contains data that needs to be preserved, just dropping the schema and rebuilding it from DDL statements is not an option.
IBM DB 2使程序员可以用熟悉的sql语句更新和删除XML数据。
IBM DB2 enables programmers to update and delete XML data using familiar SQL statements.
其中嵌入了应对没有可供删除的数据这种情况的异常处理语句，使得程序更健壮一点。
The program has nested exception handling to deal with situations in which it looks up nonexistent data to delete, making the program a bit more robust.
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