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。
They are transformations of logical data model where the entities and relationships are transformed into tables, columns, primary keys, foreign keys, and constraints.
它们由逻辑数据模型转换而来，其中实体和关系转换为表、列、主键、外键以及约束。
Each designer allows creating indexes, constraints, keys, and triggers (where applicable).
每种设计器允许创建索引、约束、键和触发器(如适用)。
ActiveRecord USES primary and foreign keys for a variety of tasks, and both are defined as constraints on your database.
ActiveRecord会为不同的任务变量使用主键和副键，它们都是作为数据库的约束而定义的。
Due to their importance in relational databases, Primary keys are the most fundamental aspect of all keys and constraints.
由于其在关系型数据库中的重要性，主键是所有键和约束里最基础的方面。
You can use table Designer to create, edit, or delete tables, columns, keys, indexes, relationships, and constraints.
可以使用表设计器创建、编辑或删除表、列、键、索引、关系和约束。
From table Designer, you can also right-click in the grid section to access dialog boxes through which you can create and modify relationships, constraints, indexes, and keys for the table.
从[资料表设计工具]，您也可以在方格区按一下滑鼠右键，存取可用以建立和修改资料表关联性、条件约束、索引和索引键的对话方块。
Pose Mode: your armature is ready to be animated, each bone can be moved, scaled or rotated, constraints get applied, you can pose your character, add keys and animate the bone's behavior over time.
姿态模式：骨骼在动画模式，骨头可以移动，缩放旋转，添加约束，你可以把你的角色摆造型，或者为他们设置关键祯。
Pose Mode: your armature is ready to be animated, each bone can be moved, scaled or rotated, constraints get applied, you can pose your character, add keys and animate the bone's behavior over time.
姿态模式：骨骼在动画模式，骨头可以移动，缩放旋转，添加约束，你可以把你的角色摆造型，或者为他们设置关键祯。
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