Question

我有一个场景，我需要在15秒内平均一次使用列，并将其总计为一小时。对于特定的MID，SID和PID，我现在通过将时间循环增加15秒dateadd（秒，15，@ StartTime）来实现它，但这非常慢。请提出更好的解决方案。请参阅下表。

 CREATE TABLE [dbo].[SampleData](
 [MID] [varchar](50) NOT NULL,
 [StartTime] [datetime] NOT NULL,
 [SID] [int] NOT NULL,
 [PID] [int] NOT NULL,
 [Usage] [decimal](10, 4) NOT NULL
 ) ON [PRIMARY]
enter code here

示例数据

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500001068 AS DateTime), 1, 1, CAST(27.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A645000020D0 AS DateTime), 1, 1, CAST(40.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500003138 AS DateTime), 1, 1, CAST(98.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A645000041A0 AS DateTime), 1, 1, CAST(58.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450010CCC8 AS DateTime), 1, 1, CAST(74.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450010DD30 AS DateTime), 1, 1, CAST(42.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450010ED98 AS DateTime), 1, 1, CAST(34.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450010FE00 AS DateTime), 1, 1, CAST(36.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500218928 AS DateTime), 1, 1, CAST(84.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500219990 AS DateTime), 1, 1, CAST(19.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450021A9F8 AS DateTime), 1, 1, CAST(40.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A6450021BA60 AS DateTime), 1, 1, CAST(48.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500324588 AS DateTime), 1, 1, CAST(97.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A645003255F0 AS DateTime), 1, 1, CAST(48.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500326784 AS DateTime), 1, 1, CAST(60.0000 AS Decimal(10, 4)))

INSERT [dbo].[SampleData] ([MID], [StartTime], [SID], [PID], [Usage]) VALUES (N'77', CAST(0x0000A64500327DC8 AS DateTime), 1, 1, CAST(48.0000 AS Decimal(10, 4)))

Answer 1

内部SQL：一分钟，一小时，一天，一年和一年中每分钟（= 15秒）的Usage的平均值。
外部SQL：每小时的上述平均值的总和。

内部SQL：每分钟（= 15秒）的Usage的平均值。

SELECT [MID], [SID], [PID], 
Yr, 
Mn,  
Dy,  
Hr
SUM(AvgUse) AS HourSumOfUse
FROM
(  
    SELECT [MID], [SID], [PID], 
    YEAR([StartTime]) AS Yr, 
    MONTH([StartTime]) AS Mn,  
    DAY([StartTime]) AS Dy,  
    DATEPART ("HH",[StartTime]) AS Hr,  
    DATEPART ("Mi", [StartTime]) AS Mn,  
    CAST(DATEPART ("ss", [StartTime])/15 + 1, Int) AS Q_Min,  
    Avg([Usage]) AS AvgUse 
    FROM [dbo].[SampleData]
    GROUP BY [MID], [SID], [PID], 
        YEAR([StartTime]),
        MONTH([StartTime]),
        DAY([StartTime]),  
        DATEPART ("HH",[StartTime]),  
        DATEPART ("Mi", [StartTime]),
        CAST(DATEPART ("ss", [StartTime])/15 + 1, Int) 
)
GROUP BY [MID], [SID], [PID], 
   Yr,
   Mn,
   Dy,
   Hr

列的平均值为15秒

1 个答案: