You can also drop primary keys, indexes, and unique constraints from the update script.

您也可以从更新指令码置放主索引键、索引和唯一的条件约束。

youdao

If you are generating data for columns that have unique constraints, it will likely fail.

如果要为具有唯一约束的列生成数据，则很可能会失败。

youdao

A one-to-one relationship is created if both of the related columns are primary keys or have unique constraints.

当两个相关列都是主键或都具有唯一约束时，将创建一对一关系。

youdao

But organizational structures each have their own unique set of constraints.

FORBES: Who Will Be The Next Iron Chef Of Innovation?

And, at the same time, we also know that black representatives, particularly in the House, face a unique set of constraints, because the Republicans basically run the House.

NPR: Black Caucus Mulls Iraq Troop Withdrawal

It is the ability to manage effectively and implement policy under a unique set of political, economic and social constraints that truly determines a leaders success, not a resume.

FORBES: Is Running A Country Like Running A Company? Should It Matter?