如何进行日期频繁更改（逐日）

Question

I want to change date in every day in my result. How it is possible

like example: WHERE REPLY_dATE BETWEEN '2017-03-17 12:00:00 AM' AND '2017-03-17 4:00:00 PM I want to replace=====2017-01-01 12:00:00 AM====today_Date 2017-03-17 4:00:00 PM=======current date

Answer 1

Use LEAST() for the first step:

LEAST(264, Round(SUM(TIMESTAMPDIFF(MINUTE,Request_Date, REPLY_dATE))/480)) as WH

Use CASE for second step:

CASE WHEN ROUND((126720-sum(TIMESTAMPDIFF(MINUTE,Request_Date, REPLY_dATE)))/480) < 0 THEN 0 
ELSE LEAST(264, Round(SUM(TIMESTAMPDIFF(MINUTE,Request_Date, REPLY_dATE))/480))
END 

If you need WH and VH as well, you can use a sub-query to avoid redundancy:

SELECT VH, WH,
CASE 
  WHEN (SELECT VH) < 0 THEN 0 
  ELSE (SELECT WH)
END AS MyComputedColumn
FROM
(
  SELECT 
  ROUND((126720-sum(TIMESTAMPDIFF(MINUTE,Request_Date, REPLY_dATE)))/480) as VH,
  LEAST(264, Round(SUM(TIMESTAMPDIFF(MINUTE,Request_Date, REPLY_dATE))/480)) as WH
  FROM bbt2.new_table
) AS X;