特定の時間にデータが返されない場合はどうすればいいですか？

Question

日付の時間範囲の間の特定の時間が存在しない場合、NULL値を返すようにしたいとします。if 2016-08-23 14:24:05には値がありません。I_Dataはnullまたはゼロを返す必要があります。下記の表と質問をご覧ください。 データを追加しました。期間は2分なので、各グループごとに120行を返します。

CREATE TABLE [dbo].[MData](
    [MID] [varchar](50) NOT NULL, 
    [StartTime] [datetime] NOT NULL, 
    [SID] [int] NOT NULL, 
    [PID] [int] NOT NULL, 
    [I_Data] [decimal](10, 4) NOT NULL, 
CONSTRAINT [PK_MData] PRIMARY KEY CLUSTERED 
(
    [MID] ASC, 
    [StartTime] ASC, 
    [SID] ASC, 
    [PID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
     IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
     ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

    GO 

SELECT MID 
    ,convert(varchar, StartTime, 120) AS StartTime 
    ,SID 
    ,PID 
    ,Max(I_Data) AS MaxData 
FROM MData where starttime between DATEADD(minute, -2, GETUTCDATE()) 
          and  GETUTCDATE() 
GROUP BY MID, SID, PID, convert(varchar, StartTime, 120) 
ORDER BY PID, convert(varchar, StartTime, 120); 



GO 
SET ANSI_PADDING OFF 
GO 
INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES  (N'77', CAST(0x0000A66B0109E8D3 AS DateTime), 1, 1, CAST(1702.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA05 AS DateTime), 1, 2, CAST(1119.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA05 AS DateTime), 1, 3, CAST(1760.0000 AS Decimal(10, 4))) 
INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA06 AS DateTime), 1, 4, CAST(1187.0000 AS Decimal(10, 4))) 
INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA08 AS DateTime), 1, 5, CAST(1769.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA08 AS DateTime), 1, 6, CAST(1686.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA09 AS DateTime), 1, 7, CAST(1000.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA0A AS DateTime), 1, 8, CAST(152.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2A AS DateTime), 1, 1, CAST(1688.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2B AS DateTime), 1, 2, CAST(1550.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2C AS DateTime), 1, 3, CAST(1897.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2D AS DateTime), 1, 4, CAST(308.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2E AS DateTime), 1, 5, CAST(1059.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2F AS DateTime), 1, 6, CAST(1432.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA2F AS DateTime), 1, 7, CAST(176.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA30 AS DateTime), 1, 8, CAST(1994.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA31 AS DateTime), 2, 1, CAST(1901.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA32 AS DateTime), 2, 2, CAST(158.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA33 AS DateTime), 2, 3, CAST(1880.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA58 AS DateTime), 1, 1, CAST(1612.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA59 AS DateTime), 1, 2, CAST(859.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5A AS DateTime), 1, 3, CAST(1214.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5B AS DateTime), 1, 4, CAST(595.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5C AS DateTime), 1, 5, CAST(127.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5D AS DateTime), 1, 6, CAST(1805.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5E AS DateTime), 1, 7, CAST(1351.0000 AS Decimal(10, 4))) 
    INSERT [dbo].[MData] ([MID], [StartTime], [SID], [PID], [I_Data]) VALUES (N'77', CAST(0x0000A66B0109EA5F AS DateTime), 1, 8, CAST(1154.0000 AS Decimal(10, 4))) 

Answer 1

次のコードを試してください。

SELECT m1.MID 
     ,convert(VARCHAR, m1.StartTime, 120) AS StartTime 
     ,m1.SID 
     ,m1.PID 
     ,Max(m2.I_Data) AS MaxData 
    FROM MData m1 
    LEFT JOIN MData m2 
     ON m1.MID=m2.MID AND m1.SID=m2.SID AND m1.PID=m2.PID 
     AND m1.starttime between DATEADD(minute, -2, GETUTCDATE()) and GETUTCDATE() 
    GROUP BY m1.MID, m1.SID, m1.PID, convert(VARCHAR, m1.StartTime, 120) 
    ORDER BY m1.PID, convert(VARCHAR, m1.StartTime, 120);