带有两个单独联接的MySQL查询

Question

Does anyone know the solution to this problem ? There are 3 Tables: orders , order_groups and stores .
I want to list the orders, with the names of the stores where the order was placed, and where the order is going to be delivered.

I keep the from_store_id , and to_store_id in the order_groups table

Listing these orders would be simple, i just left join the order_groups to orders , and select the name, from_shop_id and to_shop_id , but the problem is i want the name of the stores not the id, and the store names are placed in a different table (stores)

Here is what im talking about:

Table orders
id  group_id    name            madeup_id
1     11        johnny cash         1
2     12        billy bob           1

LEFT JOIN order_groups on order_groups.id = orders.group_id

Table order_groups
id   from_store_id   to_store_id
11     55               56
12     56               55

Table stores
id    store_name
55     thisstore
56     thatstore

The result im looking for is:
   name         from_store   to_store
1.johhny cash   thisstore, thatstore
2.billy bob     thatstore, thisstore

The statement i have yet:

SELECT 
orders.name, something as from_store, something as to_store
FROM orders
LEFT JOIN order_groups on order_groups.id = orders.group_id

somehow join stores on the order_groups.from_store_id = stores.id

WHERE orders.madeup_id = 1

Any idea how to select and join the store names to the query ?

One more question. I actually want to list two kind of orders in one query from different tables too, im on the right track with this structure ?

SELECT a,b FROM a LEFT JOIN b ON b.something=a.something WHERE something 
UNION ALL
SELECT a,b FROM c LEFT JOIN c ON c.something=a.something WHERE something

Answer 1

You only need to join 2 times the same table!

SELECT 
orders.name, fromStore.store_name as from_store, toStore.store_name as to_store
FROM orders
LEFT JOIN order_groups on order_groups.id = orders.group_id
left join stores fromStore on the order_groups.from_store_id = fromStore.id
left join stores toStore on the order_groups.to_store_id = toStore.id
WHERE orders.madeup_id = 1