Question

Is there a way to compare a datetime field in mySQL with the current date and return the time difference? I don’t really know where to start so if anyone has an idea, please point me to the right direction.

Here’s what I already tried.

SELECT *
FROM  `order` 
WHERE  `dateTimeAdded` - NOW( ) <1;

basically what I am trying to achieve is to get the orders which is saved for more than 8 hours in the database. Thanks!

Answer 1

If you want your query to have a chance of using an index on the datetime column, you should not do manipulation (functions) on the column but only on the other side:

SELECT *
FROM  `order` 
WHERE  dateTimeAdded < NOW( ) - INTERVAL 8 HOUR ;