unique constraint

常见例句

双语例句

• The unique constraint is created in the database when you save the table.
  当保存表时，将在数据库中创建该唯一约束。
• This clause is not allowed if the column is specified in the primary key, or in a unique constraint of the table (SQLSTATE 42831).
  如果表的主键或惟一性约束中指定了这个列，那么不允许使用这个子句（SQLSTATE 42831）。
• The column 'CITY' in the OFFICE_INFO nickname is unique and hence a unique constraint has been defined on the nickname OFFICE_INFO on column CITY as follows
  OFFICE_INFO 昵称中的列 'CITY' 是惟一的，因此在列 CITY 上定义了昵称 OFFICE_INFO 的惟一约束，如下所示

权威例句

• The twenties, possibly alone among the middle decades of life, are passionately celebrated in fiction and memoirs, and the celebrations tend to share a style that is personal, specific, cliquish, pastiched, breathless, often bibulous, and flagrantly confessional—the voice of early mastery without mature constraint, self-discovery at a moment when each revelation seems unique.
  NEWYORKER: Semi-Charmed Life
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