1、1=1,1=2的使用,在SQL语句组合时用的较多
“where 1=1” 是表示选择全部 “where 1=2”全部不选,
如:if @strWhere !='' beginset @strSQL = 'select count(*) as Total from [' + @tblName + '] where ' + @strWhere endelse beginset @strSQL = ' count(*) as Total from [' + @tblName + ']' end我们可以直接写成
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set @strSQL = 'select count(*) as Total from [' + @tblName + '] where 1=1 安定 '+ @strWhere 2、收缩数据库--重建索引DBCC REINDEXDBCC INDEXDEFRAG--收缩数据和日志DBCC SHRINKDBDBCC SHRINKFILE3、压缩数据库
dbcc shrinkdatabase(dbname)4、转移数据库给新用户以已存在用户权限
exec sp_change_users_login 'update_one','newname','oldname'go5、检查备份集
RESTORE VERIFYONLY from disk='E:\dvbbs.bak'6、修复数据库
ALTER DATABASE [dvbbs] SET SINGLE_USERGODBCC CHECKDB('dvbbs',repair_allow_data_loss) WITH TABLOCKGOALTER DATABASE [dvbbs] SET MULTI_USERGO7、日志清除
SET NOCOUNT ONDECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT
-- http://hovertree.com/menu/sqlserver/
USE tablename -- 要操作的数据库名SELECT @LogicalFileName = 'tablename_log', -- 日志文件名@MaxMinutes = 10, -- Limit on time allowed to wrap log. @NewSize = 1 -- 你想设定的日志文件的大小(M)Setup / initialize
DECLARE @OriginalSize intSELECT @OriginalSize = size FROM sysfiles WHERE name = @LogicalFileNameSELECT 'Original Size of ' + db_name() + ' LOG is ' + CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' + CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB' FROM sysfiles WHERE name = @LogicalFileNameCREATE TABLE DummyTrans (DummyColumn char (8000) not null) DECLARE @Counter INT, @StartTime DATETIME, @TruncLog VARCHAR(255)SELECT @StartTime = GETDATE(), @TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY'DBCC SHRINKFILE (@LogicalFileName, @NewSize)
EXEC (@TruncLog)-- Wrap the log if necessary.WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName) AND (@OriginalSize * 8 /1024) > @NewSize BEGIN -- Outer loop.SELECT @Counter = 0 WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000)) BEGIN -- update INSERT DummyTrans VALUES ('Fill Log') DELETE DummyTrans SELECT @Counter = @Counter + 1 END EXEC (@TruncLog) ENDSELECT 'Final Size of ' + db_name() + ' LOG is ' + CONVERT(VARCHAR(30),size) + ' 8K pages or ' + CONVERT(VARCHAR(30),(size*8/1024)) + 'MB' FROM sysfiles WHERE name = @LogicalFileNameDROP TABLE DummyTransSET NOCOUNT OFF8、说明:更改某个表
exec sp_changeobjectowner 'tablename','dbo'9、存储更改全部表
CREATE PROCEDURE dbo.User_ChangeObjectOwnerBatch
@OldOwner as NVARCHAR(128),@NewOwner as NVARCHAR(128)ASDECLARE @Name as NVARCHAR(128)
DECLARE @Owner as NVARCHAR(128)DECLARE @OwnerName as NVARCHAR(128)DECLARE curObject CURSOR FOR
select 'Name' = name, 'Owner' = user_name(uid)from sysobjectswhere user_name(uid)=@OldOwnerorder by nameOPEN curObject
FETCH NEXT FROM curObject INTO @Name, @OwnerWHILE(@@FETCH_STATUS=0)BEGIN if @Owner=@OldOwner begin set @OwnerName = @OldOwner + '.' + rtrim(@Name) exec sp_changeobjectowner @OwnerName, @NewOwnerend-- select @name,@NewOwner,@OldOwnerFETCH NEXT FROM curObject INTO @Name, @Owner
ENDclose curObject
deallocate curObjectGO 10、SQL SERVER中直接循环写入数据declare @i intset @i=1while @i<30begin insert into test (userid) values(@i) set @i=@i+1end案例:有如下表,要求就裱中所有沒有及格的成績,在每次增長0.1的基礎上,使他們剛好及格:Name score
Zhangshan 80
Lishi 59
Wangwu 50
Songquan 69
while((select min(score) from tb_table)<60)
begin
update tb_table set score =score*1.01
where score<60
if (select min(score) from tb_table)>60
break
else
continue
end
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