唯一约束保证在一个字段或者一组字段里的数据与表中其它行的数据相比是唯一的。
唯一约束
双语例句原声例句
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唯一约束是表的主键，因此不能移除。
Can't remove unique constraint since it's the primary key of a table.
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当保存表时，将在数据库中创建该唯一约束。
The unique constraint is created in the database when you save the table.
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表必须具有相同的主键、唯一索引或唯一约束。
Tables must have the same primary key, unique index, or unique constraint.
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So, to confine the individual, it seems, to one and only one sphere of life would seem to do an injustice to the internal psychological complexity that makes each of us who we are.
所以，将个人约束在，唯一一个人生阶层之中似乎不公,因为忽视了,内心的复杂度,而这正是让我们每一个人显得独特的原因。
应用推荐
$firstVoiceSent
- 来自原声例句