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【单选题】
在SQL Server 2000中，有学生表(学号，姓名，年龄，所在系)，学号是主码。在这个表上建有视图V1,V1视图的定义语句为： CREATE VIEW V1 AS SELECT姓名，年龄，所在系FROM学生表 WHERE年龄＞=(SELECT AVG(年龄)FROM学生表) 有下列操作语句： Ⅰ.UPDATE V1 SET年龄=年龄+1 Ⅱ.SELECT*FROM V1 WHERE年龄＞20 Ⅲ.DELETE FROM V1 WHERE年龄＞20 Ⅳ.INSERT INTO V1 VALUES(，，20,‘计算机系’) 以上语句能正确执行的是A.
仅Ⅰ和Ⅱ
B.
仅Ⅱ
C.
仅Ⅱ和Ⅳ
D.
仅Ⅰ、Ⅱ和Ⅲ
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A.
正确
B.
错误
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