以下( )操作实现了student表与sc之间的自然连接。
A:[br][/br]
B:[br][/br]
C: [br][/br]
D:
选项:
A:select student.* , sc.* from student , sc where student.sno=sc.sno
B:select student.* , cno, grade from student , sc where student.sno=sc.sno
C:select student.sno, sname,ssex,sage,sdept , cno, grade from student , sc where student.sno=sc.sno
D:select student.* , cno, grade from student join sc on student.sno=sc.sno
发布时间:2024-05-07 19:28:00