堆棧內存溢出
  簡體   English   中英

在SQL Server中使用CTE查詢進行遞歸匹配

[英]Recursive Matching using CTE Query in SQL Server

 原文  2018-02-28 14:37:37  4   3    sql/ sql-server/ pattern-matching/ common-table-expression

問題描述

我有兩個表（它們在下面定義，您可以使用下面的SQL來構建它們） 

IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'ETab')
DROP TABLE ETab;
GO

CREATE TABLE ETab 
    ([MRN] varchar(20), [LSPEC] varchar(2), [ADT] DATETIME, [SDT] DATETIME, [Source] varchar(20), [Enum] varchar(20));
GO

INSERT INTO ETab ([MRN], [LSPEC], [ADT], [SDT], [Source], [Enum]) 
VALUES 
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-04-01 00:00:00.000', 20),   CONVERT(datetime, '2017-04-30 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD04'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-05-01 00:00:00.000', 20),   CONVERT(datetime, '2017-05-31 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD05'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-06-01 00:00:00.000', 20),   CONVERT(datetime, '2017-06-30 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD06'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-07-01 00:00:00.000', 20),   CONVERT(datetime, '2017-07-31 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD07'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-08-01 00:00:00.000', 20),   CONVERT(datetime, '2017-08-31 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD08'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-09-01 00:00:00.000', 20),   CONVERT(datetime, '2017-09-30 00:00:00.000', 20),   'PRODPAT',  'HOMEBLD09'),
    ('HOMECARE',    'HQ',       CONVERT(datetime, '2017-04-01 00:00:00.000', 20),   CONVERT(datetime, '2017-04-30 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG04HM'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-05-01 00:00:00.000', 20),   CONVERT(datetime, '2017-05-31 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG05HM'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-06-01 00:00:00.000', 20),   CONVERT(datetime, '2017-06-30 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG06HM'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-07-01 00:00:00.000', 20),   CONVERT(datetime, '2017-07-31 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG07HM'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-08-01 00:00:00.000', 20),   CONVERT(datetime, '2017-08-31 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG08HM'),
    ('HOMECARE',    'HM',       CONVERT(datetime, '2017-09-01 00:00:00.000', 20),   CONVERT(datetime, '2017-09-30 00:00:00.000', 20),   'PRODPAT',  'HOMEDRG09HM'), 
    ('111824',      'UR',       CONVERT(datetime, '2017-09-22 00:00:00.000', 20),   CONVERT(datetime, '2017-09-22 00:00:00.000', 20),   'OP',   'OP1118240003'),
    ('111824',      'NL',       CONVERT(datetime, '2017-04-19 00:00:00.000', 20),   CONVERT(datetime, '2017-04-19 00:00:00.000', 20),   'OP',   'OP1118240001'),
    ('111824',      'MS',       CONVERT(datetime, '2017-06-30 00:00:00.000', 20),   CONVERT(datetime, '2017-06-30 00:00:00.000', 20),   'OP',   'OP1118240002'),
    ('111824',      'MS',       CONVERT(datetime, '2017-04-24 00:00:00.000', 20),   CONVERT(datetime, '2017-04-24 00:00:00.000', 20),   'IP',   'IP1118240001'),
    ('111824',      'MS',       CONVERT(datetime, '2017-04-28 00:00:00.000', 20),   CONVERT(datetime, '2017-04-28 00:00:00.000', 20),   'IP',   'IP1118240005'),
    ('111824',      'MS',       CONVERT(datetime, '2017-04-27 00:00:00.000', 20),   CONVERT(datetime, '2017-04-27 00:00:00.000', 20),   'IP',   'IP1118240004'),
    ('111824',      'MS',       CONVERT(datetime, '2017-04-26 00:00:00.000', 20),   CONVERT(datetime, '2017-04-26 00:00:00.000', 20),   'IP',   'IP1118240003'),
    ('111824',      'MS',       CONVERT(datetime, '2017-04-25 00:00:00.000', 20),   CONVERT(datetime, '2017-04-25 00:00:00.000', 20),   'IP',   'IP1118240002');
GO

IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'UTab')
DROP TABLE UTab;
GO

CREATE TABLE UTab 
    (MRN varchar(20), SIDate DATETIME, LSPEC varchar(2), Source varchar(20), Enum varchar(20), Iteration varchar(20));
GO

INSERT INTO UTab 
    (MRN, SIDate, LSPEC, Source, Enum, Iteration) 
VALUES 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-17 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HQ', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-04-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-01 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-06-26 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-30 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL), 
('HOMECARE', CONVERT(datetime, '2017-05-04 00:00:00.000', 20), 'HM', 'N', NULL, NULL),
('111824', CONVERT(datetime, '2017-04-21 00:00:00.000', 20), 'MS', 'IP', NULL, NULL), 
('111824', CONVERT(datetime, '2017-04-24 00:00:00.000', 20), 'NL', 'OP', NULL, NULL), 
('111824', CONVERT(datetime, '2017-04-27 00:00:00.000', 20), 'NL', 'OP', NULL, NULL), 
('111824', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'NL', 'OP', NULL, NULL), 
('111824', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'NL', 'OP', NULL, NULL), 
('111824', CONVERT(datetime, '2017-04-20 00:00:00.000', 20), 'NL', 'OP', NULL, NULL);
GO

SELECT * FROM ETab
WHERE Source = 'PRODPAT' AND LSPEC = 'HM' 
GO

SELECT * FROM UTab  
WHERE LSPEC = 'HM';
GO

IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '__Tmp')
DROP TABLE __Tmp;
GO

我有一個C＃應用程序，用戶在運行時請求certian匹配子句。 使用用戶指定的信息，我生成一些執行的SQL並更新UTab 。

通過生成的SQL，我希望執行一些匹配，根據鏈接字段[MRN]更新[UTab].[Enum] [MRN]以及[UTab].[SIDate]位於[ETab].[ADT]和[ETab].[SDT] [ETab].[ADT] [ETab].[SDT] + - 用戶指定的前幾天或之后的某天。 因此，用戶可以指定兩個命令，第一個： 

MatchCmd:MRN,LSPEC:ETab:UTab:ADT:SDT:SIDate:0:1:'Iteration#1':WHERE [UTab].[Source] = 'OP' AND [UTab].[LSPEC] = [ETab].[LSPEC]

這說，從源表ETab匹配MRN和LSPEC ，更新UTab ，其中SIDate > ADT - 0 day(s)和SIDate < SDT + 1 day(s)和[UTab].[Source] = 'OP' - 任何匹配我用“迭代次數” Iteration#1標記。

我的代碼生成以下SQL： 

;WITH cte AS (
    SELECT [ETab].[Enum] AS Enum, 
           [ETab].[MRN] AS Link, 
           [ETab].[ADT] AS ADT, 
           [ETab].[SDT] AS SDT, 
           [UTab].[SIDate] AS DT, 
           [ETab].[MRN] AS [MRN], 
           [ETab].[LSPEC] AS [LSPEC], 
           [ETab].[Source] AS [Source], 
           ROW_NUMBER() OVER (PARTITION BY [UTab].[MRN], [UTab].[LSPEC], [UTab].[SIDate] 
                ORDER BY ABS(DATEDIFF(mi, [UTab].[SIDate], [ETab].[ADT]))) AS Idx, 
           ABS(DATEDIFF(mi, [UTab].[SIDate], [ETab].[ADT])) AS Diff 
    FROM [UTab] 
        LEFT JOIN [ETab] ON [UTab].[MRN] = [ETab].[MRN] 
    WHERE ([UTab].[SIDate] BETWEEN 
        DATEADD(dd, -0, [ETab].[ADT]) AND 
        DATEADD(dd, 1, [ETab].[SDT]) AND [Iteration] IS NULL) 
            AND ETab.Source = 'OP' 
)  SELECT * 
   INTO __Tmp 
   FROM cte; 
GO

獲取符合條件的所有記錄（在時間窗口內放置並遵守自定義where子句）。 然后我通過另一個生成的查詢更新[UTab].[Enum]和[UTab].[Iteration] 

UPDATE [UTab] 
SET [ENum] = [__Tmp].[ENum], [Iteration] = N'Iteration#1' 
--SELECT __Tmp.ENum, __Tmp.Link, __Tmp.LSPEC, __Tmp.ADT, __Tmp.SDT, __Tmp.DT, __Tmp.Idx 
FROM [UTab] AS up 
    INNER JOIN [__Tmp] 
        ON [up].[MRN] = [__Tmp].[Link] 
           AND [up].[SIDate] = [__Tmp].[DT] 
           AND [up].[LSPEC] = [__Tmp].[LSPEC] 
WHERE __Tmp.Idx = 1;

這似乎工作正常，但有些問題：

問：我使用的方法/ SQL有什么明顯的問題嗎？

謝謝你的時間。

3 個解決方案

解決方案1
 3  2018-02-28 15:23:50

up.L != cte.L因為您正在尋找符合您條件並按rn過濾的任何內容。 

SELECT cte.E, [Iteration] = N'00-00-00-CA', *
FROM [Up] 
    INNER JOIN cte ON [Up].[M] = [cte].[M] AND [cte].[rn] = 1
WHERE [cte].[E] IS NOT NULL AND (
    [Up].[DTE] BETWEEN 
        DATEADD(dd, -0, [cte].[ADT]) AND 
        DATEADD(dd, 0, [cte].[SDT])) 
            AND [Up].[F] = 'Y' 
            AND [Up].[S] = 'HC' 
            ----comment this line
            --AND [Up].[L] = [cte].[L]; -- <<<<<<<<<<<<<<<<

http://sqlfiddle.com/#!18/d1483/2/0

我修改了一些數據：添加ZZ完全破壞了你的查詢。 只有兩行匹配。

ps固定插入問題，第一個插入中列出了E列和列名稱的長度。

解決方案2
 3 已采納  2018-03-08 16:27:04

CTE的用法對我來說有點奇怪，因為在后續查詢中你並沒有真正做很多事情。 我會把它移到更新。

該查詢並未真正加入Source 。 我不確定這是否意味着這樣做。 如果UTab有多個MRN / LSPEC組合源，則可能會導致問題。

所以，我想出了類似的東西： 

DECLARE @ADT_Adjustment INT = 0;
DECLARE @SDT_Adjustment INT = 1;
DECLARE @Iteration INT = 1;

WITH SequencedJoin AS (
    SELECT
        ETab.MRN, ETab.LSPEC, ETab.ADT, ETab.SDT, UTab.SIDate, ETab.Enum, ETab.[Source], UTab.Enum AS WriteEnum, UTab.Iteration AS WriteIteration
    ,   DENSE_RANK() OVER ( 
            PARTITION BY UTab.MRN, UTab.LSPEC, UTab.[Source], UTab.SIDate 
            ORDER BY ABS( DATEDIFF( MINUTE, UTab.SIDate, ETab.ADT ) ) 
        ) AS Ordinal
    FROM
        @UTab AS UTab
    JOIN    @ETab AS ETab ON (
            ETab.MRN = UTab.MRN
        AND ETab.LSPEC = UTab.LSPEC
        AND ETab.[Source] = UTab.[Source]
        AND UTab.SIDate BETWEEN DATEADD( dd, -@ADT_Adjustment, ETab.ADT ) AND DATEADD( dd, @SDT_Adjustment, ETab.SDT )
        )
    WHERE
        UTab.Iteration IS NULL
)
UPDATE
    SequencedJoin
SET
    WriteEnum = SequencedJoin.Enum
,   WriteIteration = N'Iteration#' + CAST( @Iteration AS VARCHAR( 2 ) )
WHERE
    SequencedJoin.[Source] = 'OP'
AND SequencedJoin.Ordinal = 1

解決方案3
 2  2018-03-07 19:00:37

這不是一個完整的答案，但這個指數會加速你CTE： 

CREATE INDEX T1 ON UTAB (
    MRN,
    SIDATE
)
INCLUDE
(
    LSPEC,
    Iteration
)

暫無
暫無

聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.

相關問題 SQL服務器CTE遞歸查詢 SQL Server中的遞歸CTE查詢 （CTE）遞歸SQL查詢 SQL Server：使用遞歸CTE查找值匹配總計的存儲過程 在 SQL 查詢中使用帶有 CTE 的遞歸與 C# 中的遞歸 SQL遞歸CTE查詢，奇數結果集SQL Server 2005 SQL Server使用CTE查詢分層結果 使用CTE的SQL Server 2008動態查詢 使用和不使用CTE的SQL Server查詢性能 SQL 遞歸查詢使用 CTE 過濾多個列
相關標簽
 
粵ICP備18138465號  © 2020-2024 STACKOOM.COM