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drop database dbname
3¡¢ËµÃ÷£º±¸·Ýsql server
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USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c:\mssql7backup\MyNwind_1.dat'
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BACKUP DATABASE pubs TO testBack
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create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)
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drop table tabname
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Alter table tabname add column col type
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7¡¢ËµÃ÷£ºÌí¼ÓÖ÷¼ü£º Alter table tabname add primary key(col)
˵Ã÷£ºÉ¾³ýÖ÷¼ü£º Alter table tabname drop primary key(col)
8¡¢ËµÃ÷£º´´½¨Ë÷Òý£ºcreate [unique] index idxname on tabname(col….)
ɾ³ýË÷Òý£ºdrop index idxname
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9¡¢ËµÃ÷£º´´½¨ÊÓͼ£ºcreate view viewname as select statement
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ƽ¾ù£ºselect avg(field1) as avgvalue from table1
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select count(Sname) ×ÜÈËÊý,Sdept from Student group by Sdept
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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
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