SELECT inc_day,count(task_no) FROM 任务表 WHERE inc_day<=20180814
SELECT inc_day,count(task_no) FROM 任务表 WHERE inc_day<=20180814 GROUP BY inc_day
SELECT inc_day,count(task_no) FROM 任务表 WHERE inc_day<=20180814 ORDER BY inc_day
SELECT inc_day,count(task_no) FROM 任务表 HAVING inc_day<=20180814 GROUP BY inc_day