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3£®´ð£ºÊÓͼÊÇÒ»¸öÐéÄâ±í£¬²¢²»´æ´¢ÈκÎÎïÀíÊý¾Ý¡£ÊÓͼÓëÕæÕýµÄ±íºÜÀàËÆ£¬Ò²ÊÇÓÉÒ»×éÃüÃûµÄÁкÍÊý¾ÝÐÐ×é³É£¬ÆäÄÚÈÝÓɲéѯËù¶¨Òå¡£µ«ÊÇÊÓͼ²¢²»ÊÇÒÔÒ»×éÊý¾ÝÐÎʽ´æ´¢ÔÚÊý¾Ý¿âÖУ¬Êý¾Ý¿âÖÐÖ»´æ´¢ÊÓͼµÄ¶¨Ò壬¶ø²»´æÔÚÊÓͼÖеÄÊý¾Ý£¬ÊÓͼÖеÄÊý¾ÝÈÔ´æ´¢ÔÚ»ù±¾±íÖС£µ±»ù±¾±íÖеÄÊý¾Ý·¢Éú±ä»¯Ê±£¬´ÓÊÓͼÖвéѯ³öÀ´µÄÊý¾ÝÒ²ËæÖ®¸Ä±ä¡£ÊÓͼºÍ±íÏà±ÈÓжÀÌØµÄÓÅÊÆÖ÷ÒªÓÐÒÔϼ¸¸ö·½Ã棺(1)±£Ö¤Êý¾ÝµÄ°²È«¡£(2)¼ò»¯²éѯ²Ù×÷¡£(3)±£Ö¤Êý¾ÝµÄÂß¼­¶ÀÁ¢ÐÔ¡£ Èý¡¢1. create database love on (name=lovedat,filename='d:\\database\\lovedat.mdf',size=8,Maxsize=unlimited,filegrowth=1) log on (name=lovedat_log,filename='d:\\database\\lovedat.ldf',size=5,Maxsize=30,filegrowth=5) 2. create table authors (authorid int identity(1,1) primary key not null, authorname nvarchar(50) not null,phone nvarchar(13) null, address nvarchar(255))

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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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) from student, course, sc where student.sno=sc.sno and

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