【好手来】优化索引或语句

 SELECT sum( CASE 
                              WHEN Hours.Status=2 THEN Detail.TimeSpane
                              WHEN Hours.Status=4 THEN Detail.TimeSpane*2
                              ELSE 0 END) AS TimeSpane,Detail.Submitter,
                              
                    datepart(month,Detail.StartTime) AS Months,
                    datepart(year,Detail.StartTime) AS Years

             FROM   WfWorkLogDetail AS Detail
             JOIN   WorkingHour AS Hours
               ON   Detail.StartTime> = Hours.StartTime			   
             AND   Detail.StartTime<Hours.EndTime                         
              WHERE  Hours.Status = 2
                OR  Hours.Status = 4
             GROUP BY
                    Detail.Submitter,
                    datepart(month,Detail.StartTime),
                    datepart(year,Detail.StartTime)

USE [hamp]
GO
/****** 对象:  Table [dbo].[WfWorkLogDetail]    脚本日期: 07/04/2013 12:56:02 ******/