有关系S(SNO, SNAME, SAGE),C(CNO, CNAME),SC(SNO, CNO, GRADE)。其中SNO是学生号,SNAME是学生姓名,SAGE是学生年龄, CNO是课程号,CNAME是课程名称。要查询选修“ACCESS”课且年龄不小于20的学生姓名,则SQL语句是: SELECT SNAME FROM S,C,SC WHERE子句。 这里的WHERE子句的内容是( )。
选项:
A:S.SNO = S
C:SNO and
C:CNO = S
C:CNO and SAGE>=20 and CNAME=‘ACCESS’;
B:S.SNO = S
C:SNO and
C:CNO = S
C:CNO and SAGE in>=20 and CNAME in ‘ACCESS’;
C:SAGE in>=20 and CNAME in ‘ACCESS’;
D:SAGE>=20 and CNAME=’ ACCESS’
发布时间:2024-05-07 19:26:40