行之间的最小和最大日期 - 分组行

Question

我有一张桌子＆＃34; A＆＃34;就像在图像中一样，我需要创建一个视图来将数据分组为表＆＃34; B＆＃34;。 有什么建议？我会感激每一项提高我技能的投入 感谢

table

Answer 1

这应该这样做：

SELECT [USER],
      [ACTIVITY],
      MIN([HOUR]) AS [START],
      MAX([HOUR]) AS [END],
      RIGHT('0'+CAST(DATEDIFF(SECOND, CAST(MIN([HOUR]) AS TIME), CAST(MAX([HOUR]) AS TIME)) / 3600 AS VARCHAR), 2)+':'+RIGHT('0'+CAST((DATEDIFF(SECOND, CAST(MIN([HOUR]) AS TIME), CAST(MAX([HOUR]) AS TIME)) / 60) % 60 AS VARCHAR), 2) AS [MINUTE]
FROM   TAB_A
GROUP BY [USER],
        [ACTIVITY];