填空题

软件测试分为功能测试和结构测试两类，路径测试是属于______的一种。

【参考答案】

结构测试

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单项选择题

在关系SC中，查询学习课程号为′DB′，且成绩在60至90之间的学生学号的正确的 SQL命令是

A．SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE DETWEEN 60 AND 90
B．SELECT SNO FROM SC WHERE CNO=′DB′OR GRADE BETWEEN 60 AND 90
C．SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE＞=60 AND 90
D．SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE＜=60 AND GRADE＞=90

单项选择题

下列不能实现与关系代数表达式Ⅱsname(σcname=‘DB’(SSCC))相同查询的SQL命令是

A．SELECT SNAME FROM S,SC,C WHERE SNO=SSNO AND SCNO=CNO AND CNAME=′DB′
B．SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC,C WHERE SCNO=CNO AND CNAME=′DB′)
C．SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC WHERE CNO IN(SELECT CNO FROM C WHERE CNAME=′DB′) )
D．SELECT SNAME FROM S,C WHERE CNAME=′DB′

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