Question

我有一张包含数据的表格，如下所述。

Name | Type | Data     | Time
DN60 | LTE  | CPU Load | 2/14/2016 7:00
DN60 | LTE  | CPU Load | 2/14/2016 8:00
DN60 | LTE  | CPU Load | 2/14/2016 9:00

我希望最终输出为如下所示的一行。由于日期将始终为当天，因此可以在输出中忽略日期值。

Name | Type | Data     | Time
DN60 | LTE  | CPU Load | 07:00,08:00,09:00

如何使用简单的SQL语句完成此操作。我正在使用SQL Server 2008。

Answer 1

以下是使用XML PATH技巧

的一种方法

;with cte as
(
SELECT *
FROM   ( VALUES ('DN60','LTE','CPU Load',Cast('2/14/2016 7:00' AS DATETIME)),
                ('DN60','LTE','CPU Load',Cast('2/14/2016 8:00' AS DATETIME)),
                ('DN60','LTE','CPU Load',Cast('2/14/2016 9:00' AS DATETIME)) ) cs (NAME, Type, Data, Time) 
)
SELECT DISTINCT a.NAME,
                a.Type,
                a.Data,
                LEFT(cs.time, Len(cs.time) - 1) AS time
FROM   cte a
       CROSS APPLY (SELECT CONVERT(VARCHAR(20), Time, 8) + ','
                    FROM   cte B
                    WHERE  a.NAME = b.NAME
                           AND a.Type = b.Type
                           AND a.Data = b.Data
                    FOR XML PATH('')) cs (time)

<强>结果：

╔══════╦══════╦══════════╦════════════════════════════╗
║ NAME ║ Type ║   Data   ║            time            ║
╠══════╬══════╬══════════╬════════════════════════════╣
║ DN60 ║ LTE  ║ CPU Load ║ 07:00:00,08:00:00,09:00:00 ║
╚══════╩══════╩══════════╩════════════════════════════╝

SQLFIDDLE DEMO

将类似的多行合并为一行

1 个答案: