“Create Unique Index AAA On学生表(学号)”将在学生表上创建名为AAA的()。
Which three characteristics are unique to the buying process for A small business compared with the buying process for an enterprise?()
If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?()
Unique Users
Small businesses face unique customer challenges, which three challenges are small businesses looking to overcome? ()
当指定基本表中某一列或若干列为UNIQUE约束时,则系统将在这些列上自动()一个唯一值()。
CHECK约束被称为()约束,UNIQUE约束被称为()约束。
unique sequence (单一序列)
在SQL中,可以用谓词UNIQUE来测试一个集合中是否()
UNIQUE约束强制了数据的()