检索“至少选修课程号为/'C1/'，的学生姓名(SNAME)”的SQL语句是（ ）。

A．SELECT S.sname FROM S，SC WHERE

C．cno='C1'

B．SELECT S.sname FROM S，SC WHERE

C．cno='C1'AND S.sno=S

C．sno

C．SELECT S.sname FROM S，SC FOR

C．cno='C1'

D．SELECT S.sname FROM S，sc FOR

C．cno='C1' AND S.sno=S

C．sno

[单选题]检索“至少选修课程号为'C1'的学生姓名(SNAME)”的SQL语句是A．SELECT s.sname FROM s, sc WHEREC.cno＝'C1'B．SELECT s.sname FROM s, sc WHERE C.cno='C1'AND s.sno＝sC.snoC．SELECT s.sname FROM s, sc WHERED．cno='C1'AND s.sno＝s

[单选题]检索“至少选修课程号为′C1′的学生姓名(SNAME) ”的SQL语句是A．SELECT s.sname FROM s,sc WHERE c.cno=′C1′B．SELECT s.sname FROM s,sc WHERE c.cno=′C1′AND s.sno=sc.snoC．SELECT s.sname FROM s,sc FOR c.cno=′C1′D．SELECT s.sname FROM s,sc FOR c.cno=′C1′AND s.sno=sc.sno

[单选题]设有学生选课表SC(学号,课程号,成绩)，用SQL检索同时选修课程号为“C1”和“C5”的学生的学号的正确命令是______。A．SELECT 学号 FROM SC WHERE 课程号='C1' AND 课程号='C5'B．SELECT 学号 FROM SC WHERE 课程号='C1' AND 课程号=(SELECT 课程号 FROM SC WHERE 课程号='C5')C．SELECT 学号 FROM SC WHERE 课程号='C1' AND 学号=(SELECT 学号

[单选题]查询选修了课程号为/'C2/'的学生号和姓名，若用下列SQL的SELECT语句表达时，哪一个是错误的？A．SELECT S.S#，SNAME FROM S WHERE S.S#= （SELECT SC．S# FROM SC WHERE C# = 'C2' ）B．SELECT S.S#，SNAME FROM S，SCWHERE S.S# = SC．S# AND C# = 'C2'C．SELECT S.S#，SNAME FROM S，SCWHERE S.S# = SC．S# AND C#

[单选题]查询选修了课程号为/'C2/'的学生号和姓名，若用下列SQL的SELECT语句表达时，哪一个是错误的?______。A．SELECT S.S#,SNAME FROM S WHERE S.S#=(SELECT SC.S# FROM SC WHERE C#=/'C2/')B．SELECT S.S#,SNAME FROM S,SC WHERE S.S#=SC.S# AND C#=/'C2/'C．SELECT S.S#,SNAME FROM S,SC WHERE S.S#=SC.S# AND

[单选题]查询选修了课程号为'C2'的学生号和姓名，若用下列SQL的SELECT语句表达时，哪一个是错误的?A．SELECT S．S#，SNAME FROM S WHERE S．S#=(SELECT SC．S# FROM SC WHERE C#=‘C2’)B．SELECT S．S#，SNAME FROM S，SCWHERE S．S#=SC．S#AND C#=‘C2’C．SELECT S．S#，SNAME FROM S，SCWHERE S. S#=SC．S#AND C#=‘C2’ORDER BY S．S

[单选题]设有学生选课表SC(学号，课程号，成绩)，用SQL检索同时选修课程号为“C1”和“C5”的学生的学号的正确命令是（　　）。A.SELECT学号RORM

[单选题]检索学生姓名及其所选修课程的课程号和成绩，正确的SELECT语句是______。A．SELECT S.SN,SC.C#,SC.GRADE FROMS WHERE S.S#=SC.S#B．SELCECT S.SN,SC.C#,SC.GRADE FROM SC WHERE S.S#=SC.GRADEC．SELECT S.SN,SC.C#,SC,GRADE FROM S,SC WHERE S.S#：SC.S#D．SELSECT S.SN,SC.C#,SC.GRADE FROM S,SC

[单选题]检索学生姓名及其所选修课程的课程号和成绩。正确的SELECT语句是______。A．SELECT S.SN,SC.C#,SC.GRADE FROM S WHERE S.S#=SC.S#B．SELECT S.SN,SC.C#,SC.GRADE FROM SC WHERE S.S#=SC.GRADEC．SELECT S.SN, SC.C#,SC.GRADE FROM S,SC WHERE S.S#=SC.S#D．SELECT S.SN,SC.C#,SC.GRADE FROM S,SC

[单选题]查询学生姓名及其所选修课程的课程号和成绩，正确的SQL语句是A．SELECT S.SNAME，SC.C#，GRADE FROM S WHERE S.S#=SC.S#B．SELECT S.SNAME，SC.C#，GRADE FROM SC WHERE S.S#=SC.S#C．SELECT S.SNAME，SC.C#，GRADE FROM S，SC WHERE S.S#=SC.S#D．SELECT S.SNAME，SC.C#，GRADE FROM S，SC WHERE S.S#=SC.C#