关系模式Sailors(sid,sname,age,ratring)下面哪个语句能够查找出sname属性值至少为四个字符长,并且

关系模式Sailors(sid,sname,age,ratring)下面哪个语句能够查找出sname属性值至少为四个字符长,并且开始和结束字符都是B的水手信息.

A.SELECT * FROM SAILORS WHERE sname like 'B%%_B'

B.SELECT * FROM SAILORS WHERE sname like'B__%B'

C.SELECT * FROM SAILORS WHERE sname like 'B??*B'

D.SELECT * FROM SAILORS WHERE sname like'B**?B'

正确答案是B