题目内容

以下2题基于以下说明。设有三个关系：
学生关系S(SNO,SNAME,AGE,SEX)(分别代表学生的学号、姓名、年龄、性别)
学习关系SC(SNO,CNO,GRADE)(分别代表学生的学号、课程编号、成绩)
课程关系C(CNO,CNAME,TEACHER)(分别代表课程的编号、课程名、任课教师)
“从学生关系S中检索姓王。的学生学号”的SQL语句是

A. SELECT sno FROM sc WHERE sname＝'王'
B. SELECT sno FROM sc WHERE sname IS LIKE '王%.'
C. SELECT s.sname FROM s, sc FOR C.cno＝'C1'
D. SELECT s.sname FROM s, sc FORC.cno＝'C1' AND s.sno=sC.sno

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