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【单选题】
有一个教师表teacher的结构如下: ID NUMBER(5) NAME VARCHAR2(25) EMAIL VARCHAR2(50) 下面哪个语句显示没有Email地址的教师姓名( )?A.
SELECT name FROM teacher WHERE email = NULL;
B.
SELECT name FROM teacher WHERE email <> NULL;
C.
SELECT name FROM teacher WHERE email IS NULL;
D.
SELECT name FROM teacher WHERE email IS NOT NULL;
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举一反三
【简答题】Songs which are indigenous to a specific people group or region are _____________.
【单选题】Which of the following does not belong to the same group in terms of the degree of being specific?
A.
Scientist
B.
Professional
C.
Doctor
D.
Teacher
【单选题】Which of the following terms is defined as the set of values, beliefs, rules, and institutions held by a specific group of people?
A.
law
B.
philosophy
C.
culture
D.
science
【单选题】Which specific group of genes specifies the identities of individual body segments?
A.
segmentation genes
B.
gap genes
C.
homeotic genes
D.
pair-rule genes
E.
segment-polarity genes
【单选题】Which of the following does not belong to the same group in terms of the degree of being specific?
A.
Professional.
B.
Teacher.
C.
Scientist.
D.
Doctor.
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