joining two select statements

Question

Can anyone tell me why the following won't work? It complains of a syntax error near the join key word between the two selects.

SELECT *  FROM ( select * from orders_products inner JOIN orders ON orders_products.orders_id = orders.orders_id  where products_id = 181)  as A  join   SELECT *  FROM ( select * from orders_products INNER JOIN orders ON orders_products.orders_id = orders.orders_id  where products_id = 180)  as B  on A.orders_id=B.orders_id 

Basically my first SELECT pulls all the order info for a certain product from one table and pulls the quantity ordered from another and joins them together. The second SELECT does the same thing for another product.

Now, I have

_______A_________         _______B_________
 O_ID   P_ID   Q            O_ID   P_ID   Q 
 1       180   3            1       181   11
 2       180   9            2       181   6
 3       180   5            3       181   3

And, using another join I want to get

Q_ID   P_ID1   Q1    P_ID2    Q2 
1       180    3      181     11 
2       180    9      181      6 
3       180    5      181      3

Maybe I am taking a wrong approach here. Any suggestions?

UPDATE: Here is what worked for me after pointers by RedFilter:

(SELECT *  FROM ( SELECT * FROM orders_products INNER JOIN orders ON orders_products.orders_id = orders.orders_id WHERE products_id =181) AS A LEFT JOIN ( SELECT * FROM orders_products INNER JOIN orders ON orders_products.orders_id = orders.orders_id WHERE products_id =180) AS B ON A.orders_id = B.orders_id ) UNION ( SELECT *  FROM ( SELECT *  FROM orders_products INNER JOIN orders ON orders_products.orders_id = orders.orders_id WHERE products_id =181 ) AS C RIGHT JOIN ( SELECT *  FROM orders_products INNER JOIN orders ON orders_products.orders_id = orders.orders_id WHERE products_id =180 ) AS D ON C.orders_id = D.orders_id )  

Answer 1

Not sure what you are trying to do, but you have two select clauses. Do this instead:

SELECT *  FROM ( SELECT *         FROM orders_products         INNER JOIN orders ON orders_products.orders_id = orders.orders_id         WHERE products_id = 181) AS A JOIN ( SELECT *         FROM orders_products         INNER JOIN orders ON orders_products.orders_id = orders.orders_id        WHERE products_id = 180) AS B  ON A.orders_id=B.orders_id 

Update:

You could probably reduce it to something like this:

SELECT o.orders_id,         op1.products_id,         op1.quantity,         op2.products_id,         op2.quantity FROM orders o INNER JOIN orders_products op1 on o.orders_id = op1.orders_id   INNER JOIN orders_products op2 on o.orders_id = op2.orders_id   WHERE op1.products_id = 180 AND op2.products_id = 181 

Answer 2

You should use UNION if you want to combine different resultsets. Try the following:

(SELECT *   FROM ( SELECT *          FROM orders_products          INNER JOIN orders ON orders_products.orders_id = orders.orders_id           WHERE products_id = 181) AS A) UNION   (SELECT *   FROM ( SELECT *          FROM orders_products          INNER JOIN orders ON orders_products.orders_id = orders.orders_id          WHERE products_id = 180) AS B ON A.orders_id=B.orders_id)