Clearly the use of check constraints has a minor effect on performance, but foreign keys and triggers can be extremely significant.

显然，检查约束的使用对性能有一点小小的影响，但是外键和触发器的影响却非常大。

youdao

Businesses need to impose unique constraints on this information even when they use vertical industry standards for exchange.

即使在交换中使用纵向行业标准，企业仍然需要对这些信息应用唯一的约束。

youdao

The rewrite phase will use the referential and check constraints defined on the four nicknames to eliminate the join operations and one of the UNION branches.

重写阶段将使用四个昵称上定义的引用约束和检查约束来删除连接操作和一个UNION分支。

youdao

Its adoption would leave intact unnecessary, costly constraints on the use of the most precise and predictable technology to develop products that are critical to progress and especially to sustainability in agriculture.

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He experiments with raising the ratio of investment to consumption, changing the nature and conditions of investment and shifting the balance from private to public spending, while staying within tight constraints on the use of resources.

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We were deeply troubled to learn that President Clinton has recently agreed to impose constraints on and, within a few years, to ban outright the use of even self-destructing anti-personnel landmines.

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