Question

I have to create a MySQL Query for a report.

I have a table history which keeps record of status changes of a product’s order. I have these statuses for an order’s life cycle (the flow of an order): new, confirmed, processing, shipped, delivered, cancelled, returned. An order doesn’t necessarily follow this status flow, for example: A new order can be cancelled immediately, or it can be cancelled while in processing. This makes the accurate reporting more complex.

Now I want to make a Supply Chain report of orders which were confirmed, processed, shipped and then delivered. But this report should exclude orders which were cancelled at any stage or returned.

Consider this example:

An order (id: 34) was placed by a customer. Initial status: New. Confirmed by an Agent, status set to Confirmed. Supply Chain manager verifies availability, status changes to Processing, then shipped and then delivered.

Another order (id: 55) comes, New, confirmed, processing but cancelled. history looks like:

id  order_id status
111 34       new
112 34       confirmed
113 55       new
114 55       confirmed
115 55       processing
116 34       processing
117 55       cancelled
118 34       shipped
119 34       delivered

How do I make a report query to get only those orders which were

1. Confirmed, Processed, shipped and delivered.
2. Confirmed, processed, cancelled.
3. confirmed, cancelled
4. and so on…

How can I write a query to get these kinds of reports?

Answer 1

for new order:select distinct(order_id) from history where status = new
for new processed:select distinct(order_id) from history where status = processed
and so on

for those order which are new, processed and delivered

select t1.order_id from history as t1, history as t2, history as t3 where t1.order_id=t2.order_id and t2.order_id=t3.order_id and t1.status=new and t2.status = processed and t3.status = delivered

like this go on for others