题目内容

语句SELECT MAX(Score) FROM SCInfo查询结果的记录数有（）。

A. 1
B. 3
C. 5
D. 9

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查询所有目前年龄不到18岁的学生的姓名、所在班级及年龄，正确的命令是（）。

A. SELECT StName, ClName，YEAR(GETDATE())-YEAR(birthdate) age FROM StInfo WHERE age<18
B. SELECT StName,ClName, YEAR(GETDATE())-YEAR(birthdate) FROM StInfo WHERE YEAR(birthdate)<18
C. SELECT StName, ClName, YEAR(GETDATE())-YEAR(birthdate) ageFROM StInfo WHERE YEAR(GETDATE())-YEAR(birthdate)<18
D. SELECT StName,ClName, YEAR(date())-YEAR(birthdate) FROM StInfo WHERE age<18

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从SCInfo表中找出无成绩的记录的SQL语句是（）。

A. SELECT * FROM SCInfo WHERE Score=NULL
B. SELECT * FROM SCInfo WHERE Score IS ''
C. SELECT * FROM SCInfo WHERE Score =''
D. SELECT * FROM SCInfo WHERE Score IS NULL

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