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CREATE DATABASE database-name
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drop
database dbname
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--- ´´½¨ ±¸·ÝÊý¾ÝµÄ device
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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tab_new as select col1,col2… from tab_old definition only
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Alter table tabname add primary key(col)
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tabname drop primary key(col)
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idxname on tabname(col….)
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count * as totalcount from table1
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from ta
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SQL Lite
SQLite is a small C library that implements a self-contained, embeddable, zero-configuration SQL database engine.
It is a open source product and can be downloaded from http://www.sqlite.org/ . SQL Lite is best suited in Smart Client architecture, where we can locally store all ......
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1,ɾ³ý×Ö¶Î: ALTER TABLE [tablename] DROP COLUMN [fieldname]
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2,ɾ³ýÔ¼Êø: ALTER TABLE [tablename] DROP CONSTRAINT constraint_name
ɾ³ýÔ¼ÊøÊÇÔ¼ÊøÃû²»¿É¼Óµ¥ÒýºÅ.
3,Ôö¼ÓĬÈÏÖµÔ¼Êø: ALT ......