Question

I have a table with ID (auto inc) and DATETIME.

I have been sending the date/time to mysql with $thedate=date(“Y-m-d-h-m-s”);

Now I need to find all customers who have not placed an order for 4 days say. What is the best way to do this?

Should I have used a different column type to store the information? This “listing all customers who have not ordered in last 4 days” is the only thing it is used for.

Answer 1

OMG… $thedate=date("Y-m-d-h-m-s") is wrongly formatted

should be $thedate=date("Y-m-d-H-i-s")

to get customer who has not place an order in last 4 days

select 
  user_id, max(order_date) as last_order_date
from 
  your_table
group by user_id
having last_order_date<date_sub(CURRENT_TIMESTAMP, interval 4 day);