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3. (1) alter table authors add sex char(2) null,city nvarchar(20) null; (2) alter table authors drop column city
(3) alter table authors alter column address nvarchar(500) not null 4. (1) Update ϵ²¿ set ϵÖ÷ÈÎ=¡¯ ÕÅÖÐÔ£¡¯ where ϵ²¿Ãû³Æ=¡¯¼ÆËã»úϵ¡¯ (2) Update ϵ²¿ set ϵ²¿Ãû³Æ=replace(ϵ²¿Ãû³Æ,¡¯Ïµ¡¯,¡¯¿ÆÑ§Ïµ¡¯) (3) Delete from ϵ²¿ where ϵÖ÷ÈÎ like ¡®ÕÅ%¡¯
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5. (1) select xs.xh,xm,kch,cj from xs, xs_kc where xs.xh=xs_kc.xh; (2) select xs.xh,xm,kch,cj from xs join xs_kc on xs.xh=xs_kc.xh; ËÄ¡¢1£®Create trigger insert_sjkh on dbo.ÉÏ»ú¼Ç¼ for insert As
begin
Declare @asjkh char(13) Declare @acount int
Select @asjkh=ÉÏ»úºÅfrom inserted
Select @acount=count(*) from ÉÏ»ú¿¨where ÉÏ»úºÅ=@asjkh If @acount=0
Print 'ÉÏ»ú¿¨ÖÐÎÞ´Ë¿¨ºÅ£¬²»ÄܲåÈë' Else
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where ѧÉú.ѧºÅ=¿Î³Ì×¢²á.ѧºÅ and ¿Î³Ì×¢²á.¿Î³ÌºÅ=¿Î³Ì.¿Î³ÌºÅ and ÐÕÃû=@axm END
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select sname, ssex, sdept from student where sage between 20 and 30
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select sname, sno, ssex from student where sname like 'Àî%'
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select * from student order by sdept ASC, sage DESC
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select S.sno, sname, cname, grade from student S, course C, sc SC where S.sno=SC.sno and C.cno=SC.cno
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select avg(grade) as ƽ¾ù³É¼¨,max(grade) as ×î¸ß·Ö, min(grade) as ×îµÍ
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from scwhere cno='1'
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select avg(grade) from student, course, sc where student.sno=sc.sno and
course.cno=sc.cno and sdept='IS' and cname='Êý¾Ý½á¹¹
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