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 ' + @strWhereendelse beginset @strSQL = 'select count() as Total from [' + @tblName + ']' end

我们可以直接写成

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 reindex
dbcc indexdefrag

--收缩数据和日志
dbcc shrinkdb
dbcc shrinkfile

3、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'
go

5、检查备份集
restore verifyonly from disk='E:\dvbbs.bak'

6、修复数据库

alter database [dvbbs] set single_user
go
dbcc checkdb('dvbbs',repair_allow_data_loss) with tablock
go
alter database [dvbbs] set multi_user
go

7、日志清除

set NOCOUNT ON
declare @LogicalFileName sysname,
@MaxMinutes int,
@NewSize int

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 int
select @OriginalSize = size 
from sysfiles
where name = @LogicalFileName
select '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 = @LogicalFileName
create 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)  
end
select '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 = @LogicalFileName
drop table DummyTrans
set nocount off

8、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)
AS

declare @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 sysobjects
where user_name(uid)=@OldOwner
order by name

open   curObject
fetch next form curObject into @Name, @Owner
while(@@FETCH_STATUS=0)
begin     
if @Owner=@OldOwner 
begin
   set @OwnerName = @OldOwner + '.' + rtrim(@Name)
   exec sp_changeobjectowner @OwnerName, @NewOwner
end
-- select @name,@NewOwner,@OldOwner

fetch next from curObject INTO @Name, @Owner
end

close curObject
deallocate curObject
go

10、SQL SERVER中直接循环写入数据

declare @i int
set @i=1
while @i<30
begin
    insert into test (userid) values(@i)
    set @i=@i+1
end

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   scorZhangshan 80Lishi 59Wangwu 50Songquan 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