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单项选择题
A.INSERT INTO Teachers VALUES(’T100’,’张宏’,NULL)
B.INSERT INTO Teachers(Tno,Tname,Age) VALUES(’T100’,’张宏’,30)
C.INSERT INTO Teachers(Tno,Tname) VALUES(’T100’,’张宏’)
D.INSERT INTO Teachers VALUES(’T100’,’张宏’)
单项选择题
A. Case Grade When 90~100 THEN ’优’ When 80~89 THEN ’良’ When 70~79 THEN ’中’ When 60~69 THEN ’及格’ Else ’不及格’ End
B. Case When Grade between 90 and 100 THEN Grade = ’优’ When Grade between 80 and 89 THEN Grade = ’良’ When Grade between 70 and 79 THEN Grade = ’中’ When Grade between 60 and 69 THEN Grade = ’及格’ Else Grade = ’不及格’ End
C. Case When Grade between 90 and 100 THEN ’优’ When Grade between 80 and 89 THEN ’良’ When Grade between 70 and 79 THEN ’中’ When Grade between 60 and 69 THEN ’及格’ Else ’不及格’ End
D.Case Grade When 90~100 THEN Grade = ’优’ When 80~89 THEN Grade = ’良’ When 70~79 THEN Grade = ’中’ When 60~69 THEN Grade = ’及格’ Else Grade = ’不及格’ End
单项选择题
A.SELECT Sname,MIN(Sage) FROM Student
B.SELECT Sname,Sage FROM Student WHERE Sage = MIN(Sage)
C.SELECT TOP 1 Sname,Sage FROM Student
D.SELECT TOP 1 Sname,Sage FROM Student ORDER BY Sage
单项选择题
A.SELECT Sno, COUNT(*) FROM SC GROUP BY Sno
B.SELECT Sno FROM SC GROUP BY Sno WHERE COUNT(*)> 3
C.SELECT Sno FROM SC GROUP BY Sno HAVING COUNT(*)> 3
D.SELECT Sno FROM SC GROUP BY Sno
问答题
“图书表”结构如下:
书号:统一字符编码定长类型,长度为6,主键;
书名:统一字符编码可变长类型,长度为30,非空;
第一作者:普通编码定长字符类型,长度为10,非空;
出版日期:日期型;
价格:定点小数,小数部分1位,整数部分3位,默认值为20。
写出创建表的SQL语句,要求在定义表的同时定义数据的完整性约束。(表名和列名用中文)