When ON delete set NULL is active, when a record is deleted from the parent table, all records in the child table with matching foreign key values are set to NULL.

当ON DELETE SET NULL规则被激活时，如果一条记录从父表中删除，子表中的所有记录以及匹配的外键值都被设置为NULL。

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Delete all result set columns except those required by the target table.

删除目标表不需要的所有结果集列。

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The first main COBOL program performs the standard CRUD (Create, Read, Update, Delete), operations set, acting on a single record.

第一个主cobol程序执行标准的CRUD(创建、读取、更新、删除)、操作集合，并对单个记录进行操作。

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Users can choose to delete data after a set period of time, or pass it on to specific people.

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Almost all of the machines ran outdated software with critical security vulnerabilities, and 98% contained data that the company or individual who set up the machine for users had intended to delete but could still be extracted from the machine.

FORBES: Researchers Find Amazon Cloud Servers Teeming With Backdoors And Other People's Data