Question

我有一个用户表，每个用户都有自己的电子邮件地址/用户名/密码等。

我有一个附加电子邮件的辅助表格，用户可以将其添加到他们的帐户中。两者之间的唯一链接是用户ID。

我正在尝试更新一些报告功能以准确显示这些其他电子邮件，但我希望它们全部都在一行中，并具有连续的列名。我在这方面的灵活性有限，需要将逻辑完全包装在select语句中。

目前，我正在使用Join引入第二个emailS表，并抓住emailAddress列。但是，这导致同一用户的多行，只有电子邮件地址不同，我希望它们可以压缩为一行，多列。

当前表的设置如下：

UsersXEmails

USERID | EMAILADDRESSID | EMAILADDRESS
-------------------------------------------
 001           100        email1@test.com
 001           200        email2@test.com
 001           300        email3@test.com
 002           400        testing1@gmail.com
 002           500        testing2@gmail.com
 003           600        foobar@gmail.com

是否可以在报告中包含以下输出：

USERNAME  | EMAIL   | ADDITIONALEMAIL1  | ADDITIONALEMAIL2 | ADDITIONALEMAIL3
------------------------------------------------------------------------------
Bob   | bob@bob.com |email1@test.com    |email2@test.com   | email3@test.com
Fred  | fred@fred   |testing1@gmail.com |testing2@gmail.com|             |
George| george@g.com|foobar@gmail.com   |                  |

Answer 1

对我来说，它可以处理item列，因为我可以控制动态生成的数据透视表的大小。您可以尝试下一个代码

CREATE TABLE #Table
(
    UserId INT,
    item INT,
    EmailAddressID INT,
    EmailAddress VARCHAR(50)
);

INSERT INTO #Table
SELECT '1', '1','1', 'email2@test.com' UNION ALL
SELECT '1', '2','2', 'email1@test.com' UNION ALL
SELECT '1', '3','3', 'email4@test.com' UNION ALL
SELECT '1', '4','4', 'email5@test.com'UNION ALL
SELECT '2', '1','5', 'email1@test.com' UNION ALL
SELECT '2', '2','6', 'email2@test.com' UNION ALL
SELECT '2', '3','7', 'email3@test.com' UNION ALL
SELECT '2', '4','8', 'email4@test.com' UNION ALL
SELECT '2', '5','9', 'email5@test.com' UNION ALL
SELECT '3', '1','10', 'email1@test.com' UNION ALL
SELECT '3', '2','11', 'email2@test.com' 

DECLARE @MaxItem INT

SELECT TOP 1 @MaxItem = UserId 
FROM
    (SELECT UserId, COUNT(1) AS cont 
     FROM #Table 
     GROUP BY UserId) a 
 GROUP BY 
     UserId
 ORDER BY 
     MAX(a.cont) DESC

 DECLARE @columns VARCHAR(MAX);
 DECLARE @sql NVARCHAR(max)

 SET @columns = STUFF((SELECT ',' + QUOTENAME(item)
                       FROM
                           (SELECT item 
                            FROM #Table 
                            WHERE UserId = @MaxItem) AS T
                       ORDER BY item
                       FOR XML PATH('')), 1, 1, '');

 --SELECT     *     FROM    (      SELECT  UserId, EmailAddress,EmailAddressID    FROM #Table    ) AS T    PIVOT       (    MAX(EmailAddress)    FOR EmailAddressID IN ([1],[2],[3],[4],[5])    ) AS P order by UserId;

 SET @sql = N'SELECT * 
              FROM
                  (SELECT  UserId, EmailAddress, item
                   FROM #Table) AS T
              PIVOT   
                  (MAX(EmailAddress) 
                       FOR item IN (' + @columns + N')) AS P 
              ORDER BY UserId;'; 

  -- select @sql

EXEC sp_executesql @sql;
DROP TABLE #Table;

将多个结果显示为一行

1 个答案: