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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 |
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