SQLServer缺省约束⽰例缺省约束缺省约束经过定义列的缺省value或应⽤数据库的缺省value对象绑定表的列，来指定列的缺省value。SQL Server 推荐应⽤缺省约束，⽽不应⽤定义缺省value的⽅法来指定列的缺省value。有关绑定缺省约束的窍门请参见“数据完整性”章节。定义缺省约束的语⾔规则如下：CONSTRAINT constraint_titleDEFAULT constan

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