摘要： SELECTDATEDIFF( Second, '2009-8-25 12:15:12', '2009-9-1 7:18:20') --返回相差秒数SELECTDATEDIFF( Minute, '2009-9-1 6:15:12', '2009-9-1 7:18:20') --返回相差分钟数SELECTDATEDIFF( Day, '2009-8-25 12:15:12','2009-9-1 7:18:20')--返回相差的天数SELECTDATEDIFF( Hour, '2009-8-2 阅读全文