A. create view v_student as select * from student; B. alter view v_student as select * from student; C. drop view v_student as select * from student; D. sp_help view v_student as select * from student;
A. NULL B. NOT NULL C. SEED D. IDENTITY
A. 参照完整性 B. 实体完整性 C. 域完整性 D. 以上都是
A. 【@slvar】 B. slvar C. @slvar D. @sl var
A. DAY() B. YEAR() C. MONTH() D. SECOND()