SQL order by ID desc/asc加一个排序的字段解决查询慢问题

解决方法就是在order by ID desc再加一个排序的字段，这样子可能会把速度提高很多。再加止排序的字段因查询而异了

如表


复制代码 代码如下:

CREATE TABLE [dbo].[CMPP_SendCentre] (

[id] [int] IDENTITY (1, 1) NOT NULL ,

[SendType] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[SendDate] [datetime] NOT NULL ,

[Port] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[Service_ID] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[FeeType] [varchar] (2) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[FeeCode] [varchar] (6) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[Msg_Content] [varchar] (1024) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[SendCount] [int] NOT NULL ,

[SucceedCount] [int] NOT NULL

) ON [PRIMARY]

GO

CREATE TABLE [dbo].[CMPP_SendCentreMo] (

[id] [int] IDENTITY (1, 1) NOT NULL ,

[SendCentreID] [int] NOT NULL ,

[Mo] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,

[Stat] [varchar] (10) COLLATE Chinese_PRC_CI_AS NULL

) ON [PRIMARY]

GO

CMPP_SendCentreMo.SendCentreID 与CMPP_SendCentre.ID成外建关系

于是建了一个视图


复制代码 代码如下:

CREATE VIEW dbo.ViewCMPP_SendCentreMo

AS

SELECT

dbo.CMPP_SendCentreMo.id,

dbo.CMPP_SendCentreMo.SendCentreID,

dbo.CMPP_SendCentreMo.Mo,

dbo.CMPP_SendCentreMo.Stat,

dbo.CMPP_SendCentre.SendType,

dbo.CMPP_SendCentre.SendDate,

dbo.CMPP_SendCentre.Port,

dbo.CMPP_SendCentre.Service_ID,

case dbo.CMPP_SendCentre.FeeType when ’01’ then ‘免费’ when ’02’ then ‘点播’ else ‘包月’ end as FeeType,

cast(dbo.CMPP_SendCentre.FeeCode as smallint) as FeeCode,

dbo.CMPP_SendCentre.Msg_Content

FROM dbo.CMPP_SendCentre INNER JOIN

dbo.CMPP_SendCentreMo ON

dbo.CMPP_SendCentre.id = dbo.CMPP_SendCentreMo.SendCentreID

一开始的查询语句为


复制代码 代码如下:

select top 6*from [ViewCMPP_SendCentreMo]

where SendType = ‘扣费’

order by id desc

发现非常的慢

经过了解,原因是order by id desc/asc的查询是一行一行的找数据,所以非常的慢

于是改成了


复制代码 代码如下:

select top 6*from [ViewCMPP_SendCentreMo]

where SendType = ‘扣费’

order by SendCentreID desc, id desc

查询就非常的快了