Question

I have a field date_purchased and date_ordered which are datetime fields. Now I need to fetch the record if the product was purchased after order, and if the puchase was 2 days earlier or 7 days after order:

if(date_purchased>date_ordered)
{
    if(date_purchased>(today-2) or date_puchased<(date_ordered+7))
} 

Basically, how do I translate the above code to mysql where condition( nested and/or)?

Answer 1

Use DATE_SUB() and DATE_ADD() to add days to a datetime field. The two date comparisons are enclosed in () as a single component to the AND.

WHERE
  date_purchased > date_ordered
  AND (
    date_purchased > DATE_SUB(NOW(), INTERVAL 2 DAY) 
    OR date_purchased  < DATE_ADD(date_ordered, INTERVAL 7 DAY)
  )

Note If these are DATETIME fields rather than DATE fields, you may want to strip off the time portion with DATE() so that the day comparisons start at the beginning of the day, rather than some 24 hour interval from the current time. This also means using CURDATE() instead of NOW() to get today’s date rather than a timestamp.

WHERE
  date_purchased > date_ordered
  AND (
    DATE(date_purchased) > DATE_SUB(CURDATE(), INTERVAL 2 DAY) 
    OR DATE(date_purchased)  < DATE_ADD(DATE(date_ordered), INTERVAL 7 DAY)
  )