Creating a foreign key constraint with index disabled.

创建一个索引禁用的外键约束。

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New syntax for disabling an index for foreign key constraint was added to use with the ALTER statement.

用于为外键约束禁用索引的新语句被使用alter语句添加来使用。

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In table 6, the INSERT into the Orders table fails due to a foreign key constraint violation on custno.

在表6中，对orders表执行insert语句失败，因为custno违背了外键约束。

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