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select * from
delete from department where departmentid=1
insert Department(DepartmentId,DepartmentName) values(1,'¼¼Êõ²¿')
update Department set departmentname='ÐÅÏ¢¼¼Êõ²¿' where departmentid=1
--ɾ³ý±í
drop table department
--ɾ³ýÊý¾Ý¿â
drop database bai
--ͳ¼ÆÊý¾Ý¿â±íÖмǼ
select count(*) as Êý¾Ý¿â¼Ç¼ from Department


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select count(Sname) ×ÜÈËÊý,Sdept from Student group by Sdept
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select MAX(Sage) ×î´óÄêÁä,MIN(Sage) ×îСÄêÁä from Student where
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