sql-server - SQL Server - 将一列的值显示为带有新列的单行

Question

我想在单行中显示来自 6 行的特定列的值，6 列用于 6 个值..

实际上，我们有一个列 (TestValues)，我们在其中存储 6 个由“##@##”分隔的值。但是我们希望它在 UI 上显示在不同的文本框中，但我们只能在 SQL Server 存储过程中将它们拆分。

使用此查询的当前输出:

SELECT Code,Reason, 
LTRIM(RTRIM(m.n.value('.[1]','varchar(500)'))) AS TestValues
FROM
(
SELECT Code,Reason, CAST('<XMLRoot><RowData>' + REPLACE(TestValues,'##@##','</RowData><RowData>') + '</RowData></XMLRoot>' AS XML) AS x
FROM dbo.Information where Logged_ID = 1001
)t
CROSS APPLY x.nodes('/XMLRoot/RowData')m(n)

期望的输出:

我试过下面的查询，但它不起作用......请让我知道我哪里错了。

select * from 
(   
    select *, rank() over (partition by TestValues order by code) rank from
    (
        SELECT Code,Reason, 
        LTRIM(RTRIM(m.n.value('.[1]','varchar(500)'))) AS TestValues
        FROM
        (
        SELECT Code,Reason, CAST('<XMLRoot><RowData>' + REPLACE(TestValues,'##@##','</RowData><RowData>') + '</RowData></XMLRoot>' AS XML) AS x
        FROM dbo.Information where Logged_ID = 1001
        )t
        CROSS APPLY x.nodes('/XMLRoot/RowData')m(n)
    ) r
)tab1
pivot
(
max([TestValues]) for rank in ([1],[2],[3],[4],[5],[6])) pv

Answer 1

正如我在评论中所说，目前，由于缺乏标识、排序和标签，您将获得的顺序完全是随机的。因此，您可以使用它，但每次运行查询时结果都会改变:

USE Sandbox;
GO

CREATE TABLE dbo.SampleData(Code varchar(15),
                            Reason varchar(4),
                            testValues varchar(7));
GO
INSERT INTO dbo.SampleData (Code,
                            Reason,
                            testValues)
VALUES ('Phlebotomist','test','12345'),
       ('Phlebotomist','test','23456'),
       ('Phlebotomist','test',''),
       ('Phlebotomist','test','123456'),
       ('Phlebotomist','test','1234567'),
       ('Phlebotomist','test','12345');
GO
WITH RNs AS(
    SELECT *,
           ROW_NUMBER() OVER (PARTITION BY Code, Reason ORDER BY NEWID()) AS RN --PARTITION BY is a guess, NEWID as order is random as currently stands 
    FROM dbo.SampleData)
SELECT Code, Reason,
       MAX(CASE RN WHEN 1 THEN RNs.testValues END) AS BusinessUnit,
       MAX(CASE RN WHEN 2 THEN RNs.testValues END) AS MainUnit,
       MAX(CASE RN WHEN 3 THEN RNs.testValues END) AS [Location],
       MAX(CASE RN WHEN 4 THEN RNs.testValues END) AS CustID
FROM RNs
GROUP BY Code, Reason;
GO

GO
DROP TABLE dbo.SampleData;

只要条目的顺序始终相同，这很容易修复。添加一个 IDENTITY 列(您可以使用其他内容，但您需要 一些内容 才能确定顺序):

CREATE TABLE dbo.SampleData(SomeID int IDENTITY(1,1), --Something to ORDER BY!
                            Code varchar(15),
                            Reason varchar(4),
                            testValues varchar(7));
GO
INSERT INTO dbo.SampleData (Code,
                            Reason,
                            testValues)
VALUES ('Phlebotomist','test','12345'),
       ('Phlebotomist','test','23456'),
       ('Phlebotomist','test',''),
       ('Phlebotomist','test','123456'),
       ('Phlebotomist','test','1234567'),
       ('Phlebotomist','test','12345');
GO
WITH RNs AS(
    SELECT *,
           ROW_NUMBER() OVER (PARTITION BY Code, Reason ORDER BY SomeID ASC) AS RN --NOw we have an order we can rely on!
    FROM dbo.SampleData)
SELECT Code, Reason,
       MAX(CASE RN WHEN 1 THEN RNs.testValues END) AS BusinessUnit,
       MAX(CASE RN WHEN 2 THEN RNs.testValues END) AS MainUnit,
       MAX(CASE RN WHEN 3 THEN RNs.testValues END) AS [Location],
       MAX(CASE RN WHEN 4 THEN RNs.testValues END) AS CustID
FROM RNs
GROUP BY Code, Reason;

GO
DROP TABLE dbo.SampleData;

不要忘记，表中的数据存储在堆中。它没有“内在顺序”。