以下哪些约束可用于强制执行表中记录的唯一性?( )
DEFAULT and NOT NULL constraints
FOREIGN KEY constraints
PRIMARY KEY and UNIQUE constraints
IDENTITY columns
CHECK constraints
以下哪些约束可用于强制执行表中记录的唯一性?( )
DEFAULT and NOT NULL constraints
FOREIGN KEY constraints
PRIMARY KEY and UNIQUE constraints
IDENTITY columns
CHECK constraints