经典SQL语句大全—技巧

12-24 棋牌问题 211 0

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=日志模板2”全部不选，
如：
if @s技巧敏捷打一生肖trWhere !=” 经典语录太经典了霸气
be经典语录太经典了霸气gin
set @str语句排序题SQL = ‘count() as Total from [‘ + @tblName + ‘] where ‘ + @strWhere
end
else
begin
set @strSQL = ‘count() as Total from [‘ + @tblName + ‘]’
end

我经典传奇们可以直接写成

经典SQL语句大全—技巧插图

错误！未找到目录项。
set @strSQL = ‘count() as Total from [‘ + @tblName + ‘] wh语句排序题秒杀技巧ere 1=1 安定 ‘+ @strWh数据库设计ere 2、收缩数据库
–重建索引
DBC日志大全C 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
sp_change_use数据库系统rs_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] S技巧的拼音ET SINGLE_USER
GO
DBCC C经典咏流传HECKDB(‘dvbbs’,repair_allow_data_loss) WITH TABLOCK
GO
ALTER DATABASE [dvbbs] SE数据库原理及应用T MULTI_USER
GO

7、日志日志英文清除
SET NOON
@LogicalFil技巧是什么意思eNa经典咏流传me sysname,
@MaxMinutes INT,
@NewSize INT

USE tablename — 要操作的数据库名
SELECT @LogicalFileName = ‘tablename_log’语句结构, — 日志文件名
@Ma技巧性转场xMinutes = 1经典生日祝福语大全0, — Limit on time allowed to wrap log.
@NewSize = 1 –&n语句摘抄bsp;你想设定的日志文件的大小(M)

Setup / initialize
@OriginalSize int
@OriginalSize = size
FROM sysfiles
WHERE name = @LogicalFileName
‘Original数据库技术 Size of ‘ + db_name() + ‘ LOG is ‘ +
CONVERT(VAR30),@OriginalSize) + ‘ 8K pages or ‘ +
CONVERT(VAR30),(@OriginalSize8/1024)) + ‘MB’
FROM sysfiles
WHERE日志怎么写 nam日志模板e = @LogicalFileName
CREATE TABLE DummyTrans
(DummyColumn char (8000) not null)

@Counter INT,
@StartTime DATETI技巧运动ME,
@TruncLog VAR255)
@StartTime = GETDATE(),
@TruncLog经典轩逸为什么便宜 = ‘BACKUP LOG ‘ + db_name() + ‘ WITH _ONLY’

DBCC SHRINKFILE (@LogicalFileName, @NewSize)
(@TruncLog)
— Wrap the log if necessary.
WHILE @MaxMinute语句结构s > DATEDIFF (mi, @StartTime, GETDATE()) — time has not expired
@OriginalSize = (size FROM sysfil经典电影es WHERE name = @LogicalFileName)经典语录太经典了霸气
(@OriginalSize 8语句优美的句子 /1024) > @NewSize
BEGIN — Outer loop.
@Cou经典轩逸为什么便宜n日志和日记的区别ter = 0
WHILE &n数据库系统bsp; ((@Counter < @OriginalSize / 16) (@Counter < 50000))
BEGIN — update
DummyTrans VALUES (‘Fill Log’) DummyTrans
@Counter = @Counter + 1
END
(@TruncLog)
END
‘Final Size of ‘ + db_name()语句摘抄 + ‘ LOG is ‘ +
CONVERT(VAR30),技巧运动size) + ‘ 8K pag日志es or ‘ +
CONVERT(VAR30),(size8/1024)) + ‘MB’
FROM sysfiles
WHERE nam日志英文e = @LogicalFileName
DROP数据库管理系统 TABLE DummyTrans
SET NOOFF

8、说明：更改某个表
sp_change经典电视剧objectowner ‘tablename技巧性转场‘,’dbo’

9、存储更改全部表

CREATE PROCEDURE dbo.User_ChangeObjectOwnerBatch
@OldOwner as NVAR128),
@NewOwner as NVAR128)
AS

@Name&nbs语句覆盖p;&nbs语句排序题秒杀技巧p; as NVAR128)
@Owner as NVAR128)
@OwnerName as NVAR128)

curObject CURSOR FOR
‘Name’ = name,
&nbsp日志英文; ‘Owner’ &n经典咏流传bsp; = user_name(uid)
from sysobjects经典生日祝福语大全
where user_name(uid经典轩逸为什么便宜)=@OldOwner
order by name

OPEN   curObje数据库系统工程师ct
FETCH NEXT FROM curObject INTO @Name, @Owner
WHILE(@@FETCH_STATUS=0)
BEGIN    &nbsp日志怎么写;
if @Owner=@OldOwner
begin
   set @Owne经典电影rName = @OldOwner + ‘.’ + rtrim(@N经典生日祝福语大全ame)
   sp_changeobjectowner @OwnerName, @NewOwner
end
— @name,@NewOwner,@OldOw语句是什么意思ner

FETCH NEXT FRO经典M curObjec技巧t INTO @Name, @Own日志er
END

close cur技巧是什么意思Obj语句覆盖ect
dea数据库管理系统llocate curObject
GO

10、SQL SERVER中直接循环写入数据
@i日志文件可以删除吗 int
set @i=1
while @i<30
begin
&nbsp技巧性转场; 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:

&nbs技巧敏捷p; Name 经典电影&n技巧性转场bsp; score

经典语录太经典了霸气 Zhangshan 8语句优美的句子0

经典SQL语句大全—技巧插图1