注意要添加一个约束，使这个新字段同时为blank(在HTML表单中)和nullable(在数据库中)。

Be sure to add a constraint that allows the new field to be both blank (in the HTML form) and nullable (in the database).

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在这种情况中，你把文档添加到模型的每一个元素中，包括每个列，每个表，每个约束和每个触发器。

In this activity, you add documentation to every element in the model, including every column, every table, every constraint, and every trigger.

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现在，添加一个新约束，以便在将一个列设为privacydata时检查是否存在一个masking方法。

Now, follow these steps to add a new constraint to check for the existence of a masking method if a column is set as privacy data

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相反，你必须创建一个没有约束的表，然后添加alterTABLE语句。

Instead, you must create the table without the constraint and then add it later with an ALTER table statement.

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从消息组的角度而言，要注意的第一个重要方面是向put消息选项添加了约束MQPMO_LOGICAL_ORDER。

From the point of view of message groups, the first important thing to note is that the constant MQPMO_LOGICAL_ORDER is added to the put message options.

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创建一个虚拟体，添加一个路径约束，让它跟着同一条曲线运动，但是现在(保持自动关键帧打开)回到第0帧，将百分比调到10%。

Create a dummy, and add a Path Constraint to make it follow the same spline, but now (with Auto Key on) go to frame 0 and type in 10% in the % Along Path field.

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有必要为模型添加约束，否则模型没有被限制或支撑，就会得到一个奇异解。

It is necessary to apply constraints to the model otherwise the model is not tied down or grounded and a singular solution will result.

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每个查询节点都是一个存放候选对象的地方，每个约束则标识了是否从结果集中添加还是排除候选者。

A query node is a placeholder for a candidate object, a constraint decides whether to add or exclude candidates from the result.

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每个查询节点都是一个存放候选对象的地方，每个约束则标识了是否从结果集中添加还是排除候选者。

A query node is a placeholder for a candidate object, a constraint decides whether to add or exclude candidates from the result.

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