sql - 按日期分组，不包含时间

Question

我想知道是否有一种方法可以在计算日期时将 2014-01-26 05:39:29.000 和 2014-01-26 07:45:31.000 分组为一天。我目前有以下代码，仅按其唯一的日期时间对它们进行分组。

    SELECT ETK_ExpirationDateTime, COUNT(*) as TotalRows
    FROM History_Action 
    WHERE [State] = 4
    GROUP BY ETK_ExpirationDateTime
    ORDER BY ETK_ExpirationDateTime 

是否有类型转换或我可以做些什么来使上面的这两个日期显示为总和的一行？

Answer 1

SELECT CAST(ETK_ExpirationDateTime AS DATE) AS DATE, COUNT(*) as TotalRows
FROM History_Action 
WHERE [State] = 4
GROUP BY CAST(ETK_ExpirationDateTime AS DATE)
ORDER BY 1