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_USERGODBCC CHECKDB('dvbbs',repair_allow_data_loss) WITH TABLOCKGOALTER DATABASE [dvbbs] SET MULTI_USERGO
7、日志清除SET NOCOUNT ONDECLARE @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 / initializeDECLARE @OriginalSize intSELECT @OriginalSize = sizeFROM sysfilesWHERE name = @LogicalFileNameSELECT 'Original Size of ' + db_name() + ' LOG is ' +CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' +CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB'FROM sysfilesWHERE 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 expiredAND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)AND (@OriginalSize * 8 /1024) > @NewSizeBEGIN -- Outer loop.SELECT @Counter = 0WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))BEGIN -- updateINSERT DummyTrans VALUES ('Fill Log') DELETE DummyTransSELECT @Counter = @Counter + 1ENDEXEC (@TruncLog)ENDSELECT 'Final Size of ' + db_name() + ' LOG is ' +CONVERT(VARCHAR(30),size) + ' 8K pages or ' +CONVERT(VARCHAR(30),(size*8/1024)) + 'MB'FROM sysfilesWHERE name = @LogicalFileNameDROP TABLE DummyTransSET 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 FORselect 'Name' = name, 'Owner' = user_name(uid)from sysobjectswhere user_name(uid)=@OldOwnerorder by name
OPEN curObjectFETCH NEXT FROM curObject INTO @Name, @OwnerWHILE(@@FETCH_STATUS=0)BEGINif @Owner=@OldOwnerbegin set @OwnerName = @OldOwner + '.' + rtrim(@Name) exec sp_changeobjectowner @OwnerName, @NewOwnerend-- select @name,@NewOwner,@OldOwner
FETCH NEXT FROM curObject INTO @Name, @OwnerEND
close curObjectdeallocate curObjectGO
10、SQL SERVER中直接循环写入数据declare @i intset @i=1while @i<30begininsert 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:
Namescore
Zhangshan80
Lishi59
Wangwu50
Songquan69
while((selectmin(score) from tb_table)<60)
begin
update tb_table set score=score*1.01
where score<60
if(selectmin(score) from tb_table)>60
break
else
continue
end
数据开发-经典
1.按姓氏笔画排序:Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as //从少到多
2.数据库加密:select encrypt('原始密码')select pwdencrypt('原始密码')select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同encrypt('原始密码')select pwdencrypt('原始密码')select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同
3.取回表中字段:declare @list varchar(1000),@sql nvarchar(1000)select @list=@list+','+b.name from sysobjects a,syscolumns b where a.id=b.id and a.name='表A'set @sql='select '+right(@list,len(@list)-1)+' from表A'exec (@sql)
4.查看硬盘分区:EXEC master..xp_fixeddrives
5.比较A,B表是否相等:if (select checksum_agg(binary_checksum(*)) from A) = (select checksum_agg(binary_checksum(*)) from B)print '相等'elseprint '不相等'
6.杀掉所有的事件探察器进程:DECLARE hcforeach CURSOR GLOBAL FOR SELECT 'kill '+RTRIM(spid) FROM master.dbo.sysprocessesWHERE program_name IN('SQL profiler',N'SQL事件探查器')EXEC sp_msforeach_worker '?'
7.记录搜索:开头到N条记录Select Top N * From表-------------------------------N到M条记录(要有主索引ID)Select Top M-N * From表Where ID in (Select Top M ID From表) Order by ID Desc----------------------------------N到结尾记录Select Top N * From表Order by ID Desc案例例如1：一张表有一万多条记录，表的第一个字段RecID是自增长字段， 写一个SQL语句， 找出表的第31到第40个记录。
select top 10 recid from A where recid notin(select top 30 recid from A)
分析：如果这样写会产生某些问题，如果recid在表中存在逻辑索引。
select top 10 recid from A where……是从索引中查找，而后面的select top 30 recid from A则在数据表中查找，这样由于索引中的顺序有可能和数据表中的不一致，这样就导致查询到的不是本来的欲得到的数据。
解决方案
1，用order byselect top 30 recid from A order by ricid如果该字段不是自增长，就会出现问题
2，在那个子查询中也加条件：select top 30 recid from A where recid>-1
例2：查询表中的最后以条记录，并不知道这个表共有多少数据,以及表结构。set@s='select top 1 * from Twhere pid not in (select top '+str(@count-1) +' pidfromT)'
print@sexecsp_executesql@s
9：获取当前数据库中的所有用户表select Name from sysobjects where xtype='u' and status>=0
10：获取某一个表的所有字段select name fromsyscolumnswhere id=object_id('表名')
select name fromsyscolumnswhere id in (select id fromsysobjectswhere type = 'u' and name = '表名')
两种方式的效果相同
11：查看与某一个表相关的视图、存储过程、函数select a.* fromsysobjectsa,syscommentsb where a.id = b.id and b.text like '%表名%'
12：查看当前数据库中所有存储过程select name as存储过程名称fromsysobjectswhere xtype='P'
13：查询用户创建的所有数据库select * from master..sysdatabasesD where sid not in(select sid from master..sysloginswhere name='sa')或者select dbid, name AS DB_NAME from master..sysdatabaseswhere sid <> 0x01
14：查询某一个表的字段和数据类型select column_name,data_type from information_schema.columnswhere table_name = '表名'
15：不同服务器数据库之间的数据操作
--创建链接服务器
exec sp_addlinkedserver'ITSV ', ' ', 'SQLOLEDB ', '远程服务器名或ip地址'
exec sp_addlinkedsrvlogin'ITSV ', 'false ',null, '用户名', '密码'
--查询示例
select * from ITSV.数据库名.dbo.表名
--导入示例
select * into表from ITSV.数据库名.dbo.表名
--以后不再使用时删除链接服务器
exec sp_dropserver'ITSV ', 'droplogins '
--连接远程/局域网数据(openrowset/openquery/opendatasource)
--1、openrowset
--查询示例
select * from openrowset( 'SQLOLEDB ', 'sql服务器名'; '用户名'; '密码',数据库名.dbo.表名)
--生成本地表
select * into表from openrowset( 'SQLOLEDB ', 'sql服务器名'; '用户名'; '密码',数据库名.dbo.表名)
--把本地表导入远程表
insert openrowset( 'SQLOLEDB ', 'sql服务器名'; '用户名'; '密码',数据库名.dbo.表名)
select *from本地表
--更新本地表
update b
set b.列A=a.列A
from openrowset( 'SQLOLEDB ', 'sql服务器名'; '用户名'; '密码',数据库名.dbo.表名)as a inner join本地表b
on a.column1=b.column1
--openquery用法需要创建一个连接
--首先创建一个连接创建链接服务器
exec sp_addlinkedserver'ITSV ', ' ', 'SQLOLEDB ', '远程服务器名或ip地址'
--查询
select *
FROM openquery(ITSV,'SELECT *FROM数据库.dbo.表名')