对于百万条数据进行查询：自己对2万条数据进行的测试，答案是。。。

对于sqlserver处理百万条数据时，我们要注意了，一定要设index，如果不设那么速度会很慢的。

看我的吧：

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER proc [dbo].[testTime] as
declare @d datetime --define a variable of datetime,i 'll total program 's time
set @d=getdate()

SELECT taskID
FROM Task WITH (INDEX ([PK_Task_1])) --加了一个index，名称是PK_TASK_1
--FROM Task

WHERE (taskname= '请假单')
select [语句执行花费时间(毫秒)]=datediff(ms,@d,getdate())

SQLSERVER可以在建立表时，同时建立索引(index)

CREATE TABLE [dbo].[Task](
[parentID] [int] NULL,
[projectID] [int] NULL,
[taskID] [int] IDENTITY(1,1) NOT NULL,
[TaskName] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NOT NULL,
[remark] [nvarchar](1024) COLLATE Chinese_PRC_CI_AS NULL,
[CreateTime] [smalldatetime] NOT NULL,
[CreateBy] [int] NOT NULL,
[State] [int] NOT NULL,
[DonePercent] [int] NOT NULL CONSTRAINT [DF_Task_DonePercent] DEFAULT ((0)),
[planstart] [datetime] NULL,
[planFinish] [datetime] NULL,
[realstart] [datetime] NULL,
[realFinish] [datetime] NULL,
[planWork] [float] NULL,
[realWork] [float] NULL,
[YCYAID] [int] NULL CONSTRAINT [DF_Task_YCYAID] DEFAULT ((1)),
[YCYAValue] [int] NULL CONSTRAINT [DF_Task_YCYAValueID] DEFAULT ((1)),
[taskMgrID] [int] NULL,
[levels] [int] NULL,
[quality] [int] NULL CONSTRAINT [DF_Task_quality] DEFAULT ((3)),
CONSTRAINT [PK_Task_1] PRIMARY KEY CLUSTERED
(
[taskID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]