When a primary key constraint is defined, the federated system automatically creates a unique index specification.

当定义一个主键约束时，联邦系统自动创建一个惟一的索引规范。

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Listings 5 and 6 show sample constraint failures returned from the database system.

清单5和6显示了从数据库系统中返回的失败的约束示例。

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He identified a shortage of credit as a big obstacle to growth and a shortage of capital in the banking system as the biggest constraint to increasing credit.

他指出信贷不足是经济增长的很大障碍，而银行系统资本金缺乏又是增加信贷的最大约束。

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After the Bretton Woods system collapsed in 1971, trade imbalances ceased to be much of a constraint on the developed world.

ECONOMIST: Market discipline works when other controls fail

Given that, SNP ministers say, rUK ministers and the financial system would rationally prefer a stable sterling zone rather than Scotland deploying sterling free from constraint on their northern boundary.

BBC: Scottish independence: Political battle over currency