有学生表S(S#,SN,SEX,AGE,DEPT),课程表C(C#,CN),学生选课表SC(S#,C#,GRADE),检索选修课程"C2"的学生中成绩最高的学生的学号,正确的SELECT语句是_________。
A: SELECT S# FROM SCWHERE C#="C2" AND GRADE>=(SELECT GRADE FROM SC WHERE C#="C2")
B: SELECT S# FROM SCWHERE C#="C2" AND GRADE IN(SELECT GRADE FROM SC WHERE C#="C2")
C: SELECT S# FROM SCWHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FROM SC WHERE C#="C2")
D: SELECT S# FROM SCWHERE C#="C2" AND GRADE>=ALL
A: SELECT S# FROM SCWHERE C#="C2" AND GRADE>=(SELECT GRADE FROM SC WHERE C#="C2")
B: SELECT S# FROM SCWHERE C#="C2" AND GRADE IN(SELECT GRADE FROM SC WHERE C#="C2")
C: SELECT S# FROM SCWHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FROM SC WHERE C#="C2")
D: SELECT S# FROM SCWHERE C#="C2" AND GRADE>=ALL
举一反三
- 题中假定学生关系是S(S#,SN.,SEX,AGE)，课程关系是C(C#,CNAME,TEACH-ER)，学生选课关系是SC(S#,C#,GRADE)。 检索选修课程"C2”的学生中成绩最高的学生的学号，正确的SELECT语句是______。 A: SELECT S# FORM SCWHERE C#="C2"AND GRADE＞=(SELECT GRADE FORM SCWHERE C#="C2") B: SELECT S# FORM SCWHERE C#="C2"AND GRADE IN(SELECT GRADE FORM SC.WHERE C#="C2" C: SELECT S# FORM SCWHERE C#="C2"AND GRADE NOT IN(SELECT GRADE FORM SCWHERE C#="C2") D: SELECT S# FORM SCWHERE C#="C2"AND GRADE＞=ALL(SELECT GRADE FORM SCWHERE C#="C2")
- 学生表S、课程表C和学生选课表SC，它们的结构如下： S（S#，SN，SEX，AGE，DEPT）C（C#，CN）SC（S#，C#，GRADE） 其中，S#为学号，SN为姓名，SEX为性别，AGE为年龄，DEPT为系别，C#为课程号，CN为课程名，GRADE为成绩。查询选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT语句是 A: SELECT S B: FROM SCWHERE C C: =“C2” AND GRADE >= (SELECT GRADE FROM SCWHERE C D: =“C2”) E: SELECT S F: FROM SCWHERE C G: =“C2” AND GRADE IN (SELECT MAX(GRADE) FROM SCWHERE C H: =“C2”) I: SELECT S J: FROM SCWHERE C K: =“C2” AND GRADE IN (SELECT GRADE FROM SCWHERE C L: =“C2”) M: SELECT S N: FROM SCWHERE C O: =“C2” AND GRADE > ALL (SELECT GRADE FROM SCWHERE C P: =“C2”)
- 检索选修课程"C2”的学生中成绩最高的学生的学号，正确的SELECT语句是______。 A: SELECT S# FORM SC WHERE C#="C2"AND GRADE＞=(SELECT GRADE FORM SC WHERE C#="C2") B: SELECT S# FORM SC WHERE C#="C2"AND GRADE IN(SELECT GRADE FORM SC) WHERE C#="C2" C: SELECT S# FORM SC WHERE C#="C2"AND GRADE NOT IN(SELECT GRADE FORM SC WHERE C#="C2") D: SELECT S# FORM SC WHERE C#="C2"AND GRADE＞=ALL(SELECT GRADE FORM SC WHERE C#="C2")
- 三个表学生表S、课程表C 和学生选课表SC，它们的结构如下S(S#，SN，SEX，AGE，DEPT) C(C#，CN) SC(S#，C#，GRADE) 其中：S#为学号，SN 为姓名，SEX 为性别，AGE 为年龄，DEPT 为系别，C#为课程号，CN 为课程名，GRADE 为成绩。 检索选修课程“C2”的学生中成绩最高的学生的学号，正确的 SELECT 语句是 A: ELECT S# FORM SC WHERE C#=’C2’ AND GRAD>=(SELECT GRADE FORM SC WHERE C#=’C2’) B: SELECT S# FORM SC WHERE C#=’C2’ AND GRADE IN (SELECT GRADE FORM SC WHERE C#=’C2’) C: SELECT S# FORM SC WHERE C#=’C2’ AND GRADE NOT IN (SELECT GRADE FORM SC WHERE C#=’C2’) D: SELECT S# FORM SC WHERE C#=’C2’ AND GRADE>=ALL (SELECT GRADE FORM SC WHERE C#=’C2’)
- 假设有三个基本表：学生表S、课程表C、学生选课表SC，它们的结构如下：S（S#，SN，SEX，AGE，DEPT） C（C#，CN） SC（S#，C#，GRADE）检索选修课程”C2”的学生中成绩最高的学生的学号。正确的SELECT语句是（ ）。 A: SELECT S B: FROM SC WHERE C C: =”C2” AND GRADE>=(SELECT GRADE FROM SC WHERE C D: = “C2”) E: SELECT S F: FROM SC WHERE C G: =”C2” AND GRADE IN (SELECT GRADE FROM SC WHERE C H: = “C2”) I: SELECT S J: FROM SC WHERE C K: =”C2” AND GRADE NOT IN (SELECT GRADE FROM SC WHERE C L: = “C2”) M: SELECT S N: FROM SC WHERE C O: =”C2” AND GRADE>=ALL (SELECT GRADE FROM SC WHERE C P: = “C2”)