笔记166 时间差转换

 1 --时间差转换
 2 DECLARE
 3      @dt1 datetime,
 4      @dt2 datetime
 5 ;
 6 SELECT
 7      @dt1 = '2012-07-27 11:11:00',
 8      @dt2 = '2012-07-30 21:00:00'
 9 ;
10 SELECT
11      diff_day = CONVERT(int, diff),
12      diff_time = CONVERT(varchar(10), diff, 108)
13 FROM(
14      SELECT
15           diff = @dt2 - @dt1
16 )AA
17 ;
18 
19 SELECT diff = @dt2 - @dt1