Проблема входа и выхода в SQL указывает на конкретную проблему с запросом - PullRequest
Новая
       24

Проблема входа и выхода в SQL указывает на конкретную проблему с запросом

1 голос
/ 10 апреля 2019

Справочная информация: У меня есть данные об инструментах, которые содержат сотни тысяч записей. Я упростил это, приняв временные интервалы за несколько минут. Необработанные данные будут иметь определенное чтение в определенный момент времени, например, 0,004, однако, поскольку данные, разделенные по времени, теперь представляют собой сводные данные, они теперь содержат 3 значения Min / Max / Avg одного и того же значения за интервал времени.

Я пытаюсь создать точки входа и выхода на этих данных. Единственная проблема, которую я потратил несколько дней, - это то, что я не хочу, чтобы точка выхода находилась в том же временном интервале, что и точка входа. Это должно иметь более позднюю PKey.

Например, это неправильно, поскольку первая запись входит и выходит на том же PKey. enter image description here

Глядя на данные, я выхожу из точек входа и выхода следующим образом

Введите 3550724 - Выход 3551615

Ввод 3559070 - Выход 3571982

Введите 3575126 - Выход NULL

следующим образом

enter image description here

Может кто-нибудь помочь исправить мой запрос, чтобы точки выхода всегда были позже точки входа и не были равны. Если точки выхода нет, покажите вход, но точка выхода будет нулевой.

Мой текущий запрос: 

declare @EntryMinS1 float = 0.00418848167539267;
declare @ExitMaxT1 float = 0.00429319371727749;
declare @MinPressure float = 209.424083769634;
declare @YearFrom int = 2017;

with cte2 AS 
 ( -- apply your logic to mark potential entry and exit rows
   SELECT *
     ,CASE WHEN [Pressure] >= @MinPressure and MinS1 <= @EntryMinS1 THEN pKey END AS possibleEntry 
     ,CASE WHEN [Pressure] >= @MinPressure and MaxT1 >= @ExitMaxT1 THEN pKey END AS possibleExit
   FROM dbo.tblTestIntrumentData
   where year([TimeSlice]) >= @YearFrom
 )
 , cte3 as
(
    select * 
    ,Max(possibleEntry) -- most recent possibleEntry
      Over (PARTITION BY [IntrumentId], [TestName]
            ORDER BY pKey
            ROWS Unbounded Preceding) AS lastEntry 

    from cte2
)
, cte4 as
(
    select *
    ,Max(possibleExit) -- most recent possibleExit
      Over (PARTITION BY [IntrumentId], [TestName]
            ORDER BY pKey
            ROWS BETWEEN Unbounded Preceding AND 1 Preceding) AS lastExit
    from cte3
)
,groupRows AS 
( -- mark rows from the 1st entry to the exit row
SELECT *
    -- if lastEntry <= lastExit we're after an exit and before an entry -> don't return this row
    ,CASE WHEN lastEntry <= lastExit THEN 0 ELSE 1 END AS returnFlag
    -- assign the same group number to consecutive rows in group 
    ,Sum(CASE WHEN lastEntry <= lastExit THEN 1 ELSE 0 END)
    Over (PARTITION BY [IntrumentId], [TestName]
        ORDER BY pKey
        ROWS Unbounded Preceding) AS grp
FROM cte4
WHERE (possibleEntry IS NOT NULL OR possibleExit IS NOT NULL)
    AND lastEntry IS NOT NULL
)
,rowNum AS
 ( -- get the data from the first and last row of an entry/exit group
   SELECT *
     -- to get the values of the 1st row in a group
     ,Row_Number() Over (PARTITION BY [IntrumentId], [TestName], grp ORDER BY pKey) AS rn
     -- to get the values of the last row in a group
     ,Last_Value(possibleExit)
      Over (PARTITION BY [IntrumentId], [TestName], grp
            ORDER BY pKey
            ROWS BETWEEN Unbounded Preceding AND Unbounded Following) AS ExitTimestamp
     ,Last_Value(CASE WHEN possibleExit IS NOT NULL THEN PKey END)
      Over (PARTITION BY [IntrumentId], [TestName], returnFlag, grp
            ORDER BY pKey
            ROWS BETWEEN Unbounded Preceding AND Unbounded Following) AS ExitPKey
   FROM groupRows
   WHERE returnFlag = 1
 )
select * from rowNum
where IntrumentId = 'N-12892'
and TestName = 'T451'
and rn = 1
ORDER BY IntrumentId, TestName, PKey

CREATE TABLE со схемой и данными: 

USE [dbTestData]
GO
/****** Object:  Table [dbo].[tblTestIntrumentData]    Script Date: 10/04/2019 10:13:20 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[tblTestIntrumentData](
    [TimeSlice] [datetime2](7) NULL,
    [IntrumentId] [varchar](7) NOT NULL,
    [TestName] [varchar](4) NOT NULL,
    [AvgT1] [float] NULL,
    [MinT1] [float] NULL,
    [MaxT1] [float] NULL,
    [AvgS1] [float] NULL,
    [MinS1] [float] NULL,
    [MaxS1] [float] NULL,
    [MaxT2] [float] NULL,
    [MaxS2] [float] NULL,
    [MinB1] [float] NULL,
    [Pressure] [float] NULL,
    [pKey] [bigint] NULL
) ON [PRIMARY]
GO
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T09:55:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.005, 0.004, 0.004, 0.005, 1.116, 2.36, 0.003, 13025.385, 3550724)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:00:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.005, 0.005, 0.005, 0.005, 0.005, 0.006, 2.629, 0.438, 0.001, 15149.751, 3571982)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:25:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.006, 0.006, 0.006, 0.006, 0.006, 0.007, 0.209, 2.718, 0.017, 13562.116, 3555221)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:30:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.006, 0.006, 0.006, 0.006, 0.006, 0.006, 0.487, 3.223, 0.002, 13607.694, 3555878)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:35:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.003, 0.004, 0.004, 0.003, 0.004, 5.202, 3.001, 0.001, 16065.146, 3577673)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:40:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.003, 0.004, 0.004, 0.004, 0.004, 4.482, 2.902, 0.001, 16350.153, 3578519)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:10:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.007, 0.007, 0.007, 0.007, 0.007, 0.007, 0.962, 0.275, 0.005, 13295.4, 3553139)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:45:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.005, 0.005, 0.005, 0.005, 0.005, 0.006, 4.498, 14.667, 0.004, 13854.237, 3558230)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:20:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.005, 5.426, 9.98, 0.003, 15762.039, 3575126)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:05:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.007, 0.007, 0.008, 0.008, 0.008, 0.008, 1.007, 0.524, 0.001, 13273.765, 3552443)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:15:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.007, 0.006, 0.007, 0.007, 0.007, 0.007, 3.585, 0.725, 0.003, 13378.195, 3553832)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:50:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.005, 5.779, 8.781, 0.003, 13900.076, 3559070)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T11:00:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.004, 2.537, 2.045, 0.088, 14061.833, 3560585)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:20:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.007, 0.006, 0.007, 0.007, 0.007, 0.007, 3.608, 3.609, 0.023, 13490.572, 3554492)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:55:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.004, 1.39, 1.569, 0.001, 13951.427, 3559895)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:10:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.005, 0.005, 0.005, 0.005, 0.005, 0.005, 1.141, 3.528, 0.002, 15257.154, 3573476)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:35:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.006, 0.005, 0.006, 0.006, 0.006, 0.006, 0.352, 0.898, 0.002, 13649.856, 3556601)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:40:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.005, 0.005, 0.005, 0.006, 0.005, 0.006, 4.496, 0.835, 0.001, 13824.016, 3557420)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:30:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.004, 21.651, 2.161, 0.005, 15963.565, 3576818)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-03T10:00:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.007, 0.005, 0.007, 0.007, 0.007, 0.007, 1.257, 0.301, 0.001, 13226.338, 3551615)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T03:55:26.7680000' AS DateTime2), N'N-12892', N'T451', NULL, NULL, NULL, NULL, NULL, NULL, 0.018, 0.009, 0.018, 14788.663, 3571283)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:05:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.005, 0.005, 0.005, 0.005, 0.005, 0.005, 2.333, 4.672, 0.001, 15172.775, 3572744)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:15:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.005, 0.005, 0.004, 0.005, 4.181, 2.161, 0.018, 15366.178, 3574277)
INSERT [dbo].[tblTestIntrumentData] ([TimeSlice], [IntrumentId], [TestName], [AvgT1], [MinT1], [MaxT1], [AvgS1], [MinS1], [MaxS1], [MaxT2], [MaxS2], [MinB1], [Pressure], [pKey]) VALUES (CAST(N'2018-11-04T04:25:26.7680000' AS DateTime2), N'N-12892', N'T451', 0.004, 0.004, 0.004, 0.004, 0.004, 0.004, 3.549, 3.854, 0.003, 15838.353, 3575948)

1 Ответ

1 голос
/ 10 апреля 2019

Я думаю, что это можно немного упростить, но я немного застрял, пытаясь выйти за рамки моего текущего решения, чтобы найти упрощение. В любом случае: 

declare @EntryMinS1 float = 0.00418848167539267;
declare @ExitMaxT1 float = 0.00429319371727749;
declare @MinPressure float = 209.424083769634;
declare @YearFrom int = 2017;

with cte2 AS 
 ( -- apply your logic to mark potential entry and exit rows
   SELECT *
     ,CASE WHEN [Pressure] >= @MinPressure and MinS1 <= @EntryMinS1 THEN pKey END AS possibleEntry 
     ,CASE WHEN [Pressure] >= @MinPressure and MaxT1 >= @ExitMaxT1 THEN pKey END AS possibleExit
   FROM dbo.tblTestIntrumentData
   where year([TimeSlice]) >= @YearFrom
),
cteFindExit AS
(
select *, -- find the first entry with an exit after our entry
       (SELECT MIN(pkey) FROM cte2 findExit 
         WHERE findExit.possibleExit > entrance.possibleEntry
           AND findExit.IntrumentId = entrance.IntrumentId
           AND findExit.TestName = entrance.TestName
         ) findExit
  from cte2 entrance
),
cteFindEntry AS
(
SELECT *
       -- it's not an entry if 
     , IIF(possibleEntry IS NULL  -- isn't a possible entry
           OR findExit = LAG(findExit, 1, 0) OVER (PARTITION BY IntrumentId, TestName ORDER BY pkey) -- or has the same exit as the previous record
           OR COALESCE(possibleExit, findExit) IS NULL, -- or doesn't have an exit at all
           0,
           1 -- yeah it's a starter all right
           ) AS starter
  FROM cteFindExit
)
SELECT * FROM cteFindEntry WHERE starter = 1

possibleEntry и findExit определяют набор. Вот рабочий пример для dbfiddle .

В cteFindExit Я ищу первую запись, которая является возможным выходом и происходит после возможной записи здесь. Так что для наших начальных рядов это будет выход. Затем в cteFindEntry я отбрасываю все строки, которые на самом деле не являются первыми записями, и это происходит, когда:

  • либо запись вообще не является записью
  • или, для тех, у кого выход (из cteFindExit) такой же, как у их предшественника (это относится ко второй группе из вашего скриншота)
  • или, для тех, кто не имеет возможного выхода, отличного от них, возможный выход установлен (это будет применяться в третьей группе, когда выход действительно равен NULL, и найдет первую запись из этой группы )
...