This constraint forces any type 't' to have a default constructor, that is, a constructor that takes no parameters.
这个约束强制任何类型'T '都必须具有无参数的公共构造函数。
A workaround to this is to supply a default value to the not NULL column whose value comes from a BEFORE INSERT TRIGGER, so that the constraint is not violated.
一种解决方法是给从BEFORE INSERT触发器取得值的NOT null列提供默认值，这样就不会违反约束。
Only the role field - the one that had a default value of user - passed the implicit nullable constraint.
只有role字段—其默认值为user—通过隐含的nullable约束。
After the buyer to pay a large set, the larger the amount of some relatively large, more role is to prevent the seller from default, with a higher deposit as a constraint.
之后买方再支付一笔大定，大定金额相对较大一些，更多的作用在于防止卖方违约，用较高的定金作为约束。
If a NOT NULL constraint is specified, then the column must have a default value other than NULL.
如果规定一个不允许有空值是一个约束，那么字段必须有一个不同于空值的默认值。
MDRBR algorithm improves efficiency of existing algorithms for mining default rules with support measure constraint.
MDRBR算法通过规则支持度进行约束，可有效提高缺省规则的挖掘效率。
From the economic point of view, if the cost of default is zero, the constraint will be lost, inevitably leading to the loss of transaction security.
从经济学角度，如果当事人违约成本为零时违约行为将失去约束，必然导致交易安全的沦丧。
Element's type does not allow fixed or default value constraint.
元素的类型不允许使用固定值约束或默认值约束。
Creates a constraint for the selected database table and provides a default name and other values for the constraint.
为选定的数据库表创建约束，并为该约束提供默认名称和其他值。
Creates a constraint for the selected database table and provides a default name and other values for the constraint.
为选定的数据库表创建约束，并为该约束提供默认名称和其他值。
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