---第一种方法定义起止时间：
declare @begin_date datetime
declare @end_date datetime
select @begin_date = getdate()
-------要执行的SQL语句
select * from CBO_Account
----------
select @end_date = getdate()
select datediff(ms,@begin_date,@end_date) as '用时/毫秒'declare @begin_date datetime 
