select * from student where sno= ’ 05880101 ’ union select * from student where sno= ’ 05880102 ’ 与此查询语句等价的选项是( ) 。
A.
select * from student where sno= ’ 05880101 ’ and sno= ’ 05880102 ’
B.
select * from student where sno= ’ 05880101 ’ or sno= ’ 05880102 ’
C.
select * from student where sno= ’ 05880101 ’
D.
select * from student where sno= ’ 05880102 ’