我有下面的sql查询。只有一个表的SQL查询 - 花费太多时间
declare @RoleID int
SELECT @RoleID = RoleID FROM RoleMaster WHERE RoleEnglishDesc = 'Surveyor'
SELECT * FROM (
SELECT
S.ShiftID, 2 AS Flag, ISNULL(U.Latitude, 0) Latitude, ISNULL(U.Longitude, 0) Longitude,
U.EmployeeEnglishName AS ToolTipEnglish, U.EmployeeArabicName AS ToolTipArabic,
0 AS CaseStageID, COUNT(C.SurveyorAssigned) AS Assigned
-- L.EntryTime AS LastEntryTime
-- S1.cnt AS OnBreak
FROM
Users U
INNER JOIN dbo.SurveyorShift S ON S.UserId = U.UserID AND S.ShiftStatus = 1
LEFT JOIN CaseInfoCommandQueue C ON C.SurveyorAssigned = U.UserID
WHERE U.IsActive = 1
AND NULLIF(NULLIF(U.Latitude, '0'), '') IS NOT NULL
AND NULLIF(NULLIF(U.Longitude, '0'), '') IS NOT NULL
AND ((U.RoleID = @RoleID) OR (U.RoleID2 = @RoleID) OR (U.RoleID3 = @RoleID))
GROUP BY U.UserID, RoleID, Latitude, Longitude, EmployeeEnglishName, EmployeeArabicName, ShiftID
) D
OUTER APPLY
(
SELECT TOP 1 EntryTime FROM DeviceUserLocation DLoc
WHERE DLoc.ShiftID = D.ShiftID ORDER BY DLoc.EntryTime DESC
) AS L
我唯一的问题在最后一个外面申请获取进入时间。因为外部应用只需要10秒。该表的DeviceUserLocation也有条目。任何克服或步骤使用其他方式的顶部1?
使您的表主键和外键作为索引。它将加快您的查询结果。 – Rahul 2013-03-19 09:07:46