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B
