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我已经花了一整天的时间，只是不明白。通常我很擅长这些东西，但我只是回到 SQL 中，只是无法弄清楚这一点。您可以提供的任何帮助将不胜感激。

我正在运行 SQL Server 2008 R2。我有一个数据库，用于保存患者数据（没有姓名，只有标识符）和临床测试结果。我已经整理了一个视图来查询各种数据表并将我需要的信息收集到一个位置。我的查询结果给了我一个像这样的表：（测试和值是组成的 - 我对测试一无所知。我只是技术 - 哈哈。）

PtName   |  Age  |  Race  |  Ethnicity    |  DrawDate   |  TestType   | TestResult
PT001    |  17   |  White |  Non-Hispanic |  05/17/2011 |  WBC        | 6.8
PT001    |  17   |  White |  Non-Hispanic |  05/17/2011 |  HGB        | 14.1
PT001    |  17   |  White |  Non-Hispanic |  05/17/2011 |  Platelets  | 142.0
PT001    |  17   |  White |  Non-Hispanic |  05/29/2011 |  WBC        | 7.2
PT002    |  34   |  White |  Hispanic     |  05/17/2011 |  WBC        | 7.8
PT002    |  34   |  White |  Hispanic     |  05/17/2011 |  Platelets  | 255.0

我想要的是：

PtName   |  Age  |  Race  |  Ethnicity    |  DrawDate   |  WBC  |  HGB  |  Platelets
PT001    |  17   |  White |  Non-Hispanic |  05/17/2011 |  6.8  |  14.1 |  142.0
PT001    |  17   |  White |  Non-Hispanic |  05/29/2011 |  7.2  |       |     
PT002    |  34   |  White |  Hispanic     |  05/17/2011 |       |       |  255.0

我制定了一个 PIVOT 查询（第一个 - 非常自豪，没有工作 - 不那么自豪），但后来意识到在 PIVOT 查询中使用聚合不会让我对每个患者进行多次访问。

我正在与数百名患者打交道，其中一些患者多次就诊，每人最多进行八次测试。PIVOT 查询是处理此问题的最佳方法吗？有没有更好的办法？也许是某种形式的子查询？我愿意尝试任何事情。

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2 回答 2

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测试数据

CREATE TABLE #myTable (PtName NVARCHAR(20),Age INT,Race NVARCHAR(30),Ethnicity NVARCHAR(50)
                        ,DrawDate DATE, TestType NVARCHAR(50), TestResult NUMERIC(20,1))
GO
INSERT INTO #myTable
VALUES
('PT001',17,'White','Non-Hispanic','05/17/2011','WBC',6.8),
('PT001',17,'White','Non-Hispanic','05/17/2011','HGB',14.1),
('PT001',17,'White','Non-Hispanic','05/17/2011','Platelets',142.0),
('PT001',17,'White','Non-Hispanic','05/29/2011','WBC',7.2),
('PT002',34,'White','Hispanic','05/17/2011','WBC',7.8),
('PT002',34,'White','Hispanic','05/17/2011','Platelets',255.0)

询问

SELECT PtName, Age, Race, Ethnicity, DrawDate, [WBC], [HGB], [Platelets]
FROM (SELECT * FROM #myTable)t
  PIVOT (
         MAX(TestResult)
         FOR TestType
         IN ([WBC], [HGB], [Platelets])
         )p

结果集

╔════════╦═════╦═══════╦══════════════╦════════════╦═════╦══════╦═══════════╗
║ PtName ║ Age ║ Race  ║  Ethnicity   ║  DrawDate  ║ WBC ║ HGB  ║ Platelets ║
╠════════╬═════╬═══════╬══════════════╬════════════╬═════╬══════╬═══════════╣
║ PT001  ║  17 ║ White ║ Non-Hispanic ║ 2011-05-17 ║ 6.8 ║ 14.1 ║ 142.0     ║
║ PT001  ║  17 ║ White ║ Non-Hispanic ║ 2011-05-29 ║ 7.2 ║ NULL ║ NULL      ║
║ PT002  ║  34 ║ White ║ Hispanic     ║ 2011-05-17 ║ 7.8 ║ NULL ║ 255.0     ║
╚════════╩═════╩═══════╩══════════════╩════════════╩═════╩══════╩═══════════╝
于 2013-12-30T20:57:43.780 回答
0

我做了这样的事情：

SELECT 
x.PtName,
x.Age,
x.Race,
x.Ethnicity,
x.DrawDate, 
(
    SELECT y.TestResult
    FROM `TABLE 1` as `y` 
    WHERE x.TestType = 'WBC' 
    AND x.PtName = y.PtName
    AND x.DrawDate = y.DrawDate
    LIMIT 1
) AS 'WBC',
(
    SELECT z.TestResult
    FROM `TABLE 1` as `z` 
    WHERE z.TestType = 'HGB' 
    AND x.PtName = z.PtName
    AND x.DrawDate = z.DrawDate
    LIMIT 1
) AS 'HGB',
(
    SELECT v.TestResult
    FROM `TABLE 1` as `v` 
    WHERE v.TestType = 'Platelets' 
    AND x.PtName = v.PtName
    AND x.DrawDate = v.DrawDate
    LIMIT 1
) AS 'Platelets'
FROM `TABLE 1` as `x`
GROUP BY PtName, DrawDate

我敢肯定这不是很快，但至少对我有用；）

于 2013-12-30T20:35:33.867 回答