Question

有没有办法在sql server 2012数据库中执行更新，但只能在时间部分执行更新？

我有这些数据：

id | date
1  | 2013-09-01 15:25:58.526
2  | 2013-05-10 12:12:34.345
3  | 2013-05-10 11:23:33.234
4  | 2013-04-07 15:34:01.345

我想把所有时间都改为00：00：00.000 ......我怎么能这样做？

Answer 1

你可以尝试

UPDATE Table1 SET [date] = CAST([date] as DATE)

SQL Fiddle DEMO

另一种选择是

UPDATE Table1 SET [date] = DATEADD(dd, 0, DATEDIFF(dd, 0, [date]));

Answer 2

UPDATE YOUR_TABLE 
SET date = CAST(
            FLOOR( 
                CAST( date AS FLOAT ) 
            ) AS DATETIME
        )