vertica时间计算SQL语句实例：统计一天内登录的用户

SQL语句实例：

select count(id) as num from public.user where cast((CURRENT_TIMESTAMP-login_timed) day as integer )<=1;

或

select count(id) as num from public.user where cast((CURRENT_TIMESTAMP-login_timed) hour as integer )<=24;

大家能够依据表结构稍作调整后使用