SQL order by ID desc/asc加一個排序的字段解決查詢慢問題的示例分析

本篇文章為大家展示了SQL order by ID desc/asc加一個排序的字段解決查詢慢問題的示例分析，內(nèi)容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。

解決方法就是在order by ID desc再加一個排序的字段，這樣子可能會把速度提高很多。再加止排序的字段因查詢而異了 如表

代碼如下: 

 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 與CMPP_SendCentre.ID成外建關(guān)系

于是建了一個視圖 

代碼如下: 

 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 '免費' when '02' then '點播' 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

一開始的查詢語句為

 代碼如下: select top 6*from [ViewCMPP_SendCentreMo] where SendType = '扣費' order by id desc

發(fā)現(xiàn)非常的慢 經(jīng)過了解,原因是order by id desc/asc的查詢是一行一行的找數(shù)據(jù),所以非常的慢 于是改成了

 代碼如下: select top 6*from [ViewCMPP_SendCentreMo] where SendType = '扣費' order by SendCentreID desc, id desc

查詢就非常的快了

上述內(nèi)容就是SQL order by ID desc/asc加一個排序的字段解決查詢慢問題的示例分析，你們學(xué)到知識或技能了嗎？如果還想學(xué)到更多技能或者豐富自己的知識儲備，歡迎關(guān)注億速云行業(yè)資訊頻道。