PHP MYSQL query data between date and time fields HEROKU

Question

i have to query data in certain range of date and time. I have a ClearDB database in heroku with 2 fields to save date and time, these fiels are varchar type, not DATE. Data Structure here and don't look the field names, i have changed below in the querys for better understanding.

I have this query that works:

SELECT 
DISTINCT dates, times, lat, long, ide FROM data 
WHERE ide = 'lcg1234' AND (dates>= '2016-01-27' AND times>='15:00:00') 
 AND (dates<= '2016-01-29' AND times<='16:00:00') 
 ORDER BY times ASC

The problem is when i change the time in the last AND to a lower value like this:

SELECT 
DISTINCT dates, times, lat, long, ide FROM data 
WHERE ide = 'lcg1234' AND (dates>= '2016-01-27' AND times>='15:00:00') 
AND (dates<= '2016-01-29' AND times<='01:00:00') 
ORDER BY times ASC

It not work, why this happend? any ideas are wellcome! and sorry for my bad english.

Answer 1

You should combine dates and times column and make custom date time field. And then make comparisons.

Check if following query works.

SELECT 
DISTINCT dates, times, lat, long, ide FROM data 
WHERE ide = 'lcg1234' 
AND CONCAT(`dates`,' ',`times`) >= '2016-01-27 15:00:00' 
AND CONCAT(`dates`,' ',`times`) <= '2016-01-29 01:00:00'
ORDER BY times ASC