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”)
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”)
举一反三
- 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语句为（ ）。 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’)
- 检索选修“C2”课程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 FORM sc WHERE c L: =’C2’); M: SELECT s N: FROM sc WHERE c O: =’C2’ AND grade＞＝(SELECT max(grade) FROM sc WHERE c P: =’C2’);
- 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
- 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 SNO FROM SC WHERE CNO='C2' AND GRADE >= ( SELECT GRADE FORM SC WHERE CNO='C2' ); B: SELECT SNO FROM SC WHERE CNO='C2' AND GRADE IN ( SELECT GRADE FORM SC WHERE CNO='C2' ); C: SELECT SNO FROM SC WHERE CNO='C2' AND GRADE NOT IN ( SELECT GRADE FORM SC WHERE CNO='C2' ); D: SELECT SNO FROM SC WHERE CNO='C2' AND GRADE >= ALL ( SELECT GRADE FORM SC WHERE CNO='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")