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IF EXISTS (SELECT name from master.dbo.sysdatabases WHERE name = N'MyDatabase')
DECLARE @backupdate varchar(255);
DECLARE @result int
DECLARE @result1 int
DECLARE @dbid uniqueidentifier
SET @dbid = NEWID()
EXEC @result = xp_cmdshell 'cd D:\SQLServerBackups';
IF (@result = 1)
EXEC @result1 = xp_cmdshell 'MKDIR D:\SQLServerBackups';
if (@result1=0)
 set @backupdate = 'D:\SQLServerBackups\'
  + cast(Year(getdate()) as char(4))
  + '-'+cast(Month(getdate()) as char(2))
  + '-'+cast(Day(getdate())  as char(2))
  + '-'+ cast(@dbid  as varchar(50))
  + '-MyDatabase.bak';
 BACKUP DATABASE MyDatabase
 TO DISK = @backupdate WITH FORMAT;
 --Drop database MyDatabase;
GO
--±¸·ÝMyDatabaseÊý¾Ý¿â
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access±íʾΪ£º#1981-28-12#
SQLSERVER2000±íʾΪ£º''1981-02-12''
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Update Tab1
SET a.Name = b.Name
from Tab1 a,Tab2 b
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import java.sql.*;
/*
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*
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public class JDBC {
  
public static void main(String[] args)throws Exception {
  
   Connection conn=null;
  
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·½°¸2£º select top 10 * from t where id in (select top 40 id from t order by id)oder by id desc
mysql: select * from t order by id limit 30,10
oracle: select * from (select rownu ......
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