I can fetch too many columns, or leave off important structural database features, like indexes or null constraints.
我所能获取的列太多，又很容易遗漏重要的结构化数据库特性，比如索引或空约束。
When you delete a record, RFX sets all the fields to NULL as a reminder that the record is deleted and you must move off it.
当您删除记录时，RFX将所有字段设置为NULL，提醒您该记录已删除，您必须将其移走。
When you delete a record, RFX sets all the fields to NULL as a reminder that the record is deleted and you must move off it.
当您删除记录时，RFX将所有字段设置为NULL，提醒您该记录已删除，您必须将其移走。
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