多个条件与加入

Question

I am stuck in a problem since long.

I have a table for orders of customers, I want to get 4 types of results like

1st: All orders with status=place

then 2nd: All orders with status=place and customer is new (no previous record in order table of this customer),

then 3rd: All orders with status=place and customer have at least 1 order delivered and never returned previous order ,

then 4th: All orders with status=place and customer have atleast 1 order with status=returned

Query for 1st step is working fine, but i got no idea to get other results.I know its like an assignment but i need help.

MY Try for 1st step

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o  
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
ORDER BY o.order_id DESC 

This give me perfect result for step one.I am using OpenCart 2.2.0.0

Database Structure

|order_id |status | payment_code |customer_id |
|---------|-------|--------------|------------|
| 10      | place | cod          |   5        |
| 11      | delvr | cod          |   4        |
| 12      | return| pp_express   |   5        |
| 13      |process| paytabs      |   2        |

Any help or suggestion will be appreciated. Ask me for anything you need more.

Answer 1

Not sure to understand your DB structure, but I will try...

Ad 2:

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
AND o.customer_id NOT IN (SELECT o2.customer_id from order o2 WHERE o2.order_id != o.order_id AND o2.customer_id = o.customer_id)
ORDER BY o.order_id DESC 

Accordingly, ad 4:

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
AND o.customer_id IN (SELECT o2.customer_id from order o2 WHERE o2.order_status = 'returned')
ORDER BY o.order_id DESC 

Now for 3:

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '...?') 
AND o.customer_id NOT IN (SELECT o2.customer_id from order o2 WHERE o2.order_status = 'returned')
AND o.customer_id IN (SELECT o3.customer_id from order o3 WHERE o3.order_status = 'delivered')
ORDER BY o.order_id DESC 

BTW: I strongly recommend to rename table "order" since "order" is an SQL keyword.

Answer 2

I think you should use Union when you want to do that with one query.

Other ways, when same customer meets 2 contidions, then you will only see one.

https://www.w3schools.com/sql/sql_union.asp

Answer 3

For the 2nd query : you can just add an AND clause to your SQL : AND user_id = 0

Assuming a new order is inserted with user_id = 0 if this is a new user

Answer 4

queries: the queries are as per your question u asked and you orders table structure(i am considering that you have not created any column like created_at and updated_at).

1. select * from orders where status = 'place';

2. select orders.order_id ,orders.customer_id from orders where status = 'place' GROUP BY order_id, customer_id HAVING COUNT(customer_id) = 1;

3. select a.order_id, a.customer_id from orders a where a.status in (select b.status from orders b where a.order_id = b.order_id and status <> 'return') and a.status = 'place' GROUP BY a.order_id, a.customer_id HAVING COUNT(a.customer_id) >= 1;

4. select a.order_id, a.customer_id from orders a where a.status in (select b.status from orders b where a.order_id = b.order_id and status = 'return') and a.status = 'place' GROUP BY a.order_id, a.customer_id HAVING COUNT(a.customer_id) >= 1