Need Help in creating a subquery using JOIN operation

Hi,
I am new to SQL and trying to write a query. Please help me in this.
The Database Schema looks like this:
The database scheme consists of four tables:
Product(maker, model, type)
PC(code, model, speed, ram, hd, cd, price)
Laptop(code, model, speed, ram, hd, screen, price)
Printer(code, model, color, type, price)
The table "Product" includes information about the maker, model number, and type ('PC', 'Laptop', or 'Printer'). It is assumed that model numbers in the Product table are unique for all the makers and product types. Each PC uniquely specifying by a code in the table "PC" is characterized by model (foreign key referencing to Product table), speed (of the processor in MHz), total amount of RAM - ram (in Mb), hard disk drive capacity - hd (in Gb), CD ROM speed - cd (for example, '4x'), and the price. The table "Laptop" is similar to that one of PCs except for the CD ROM speed, which is replaced by the screen size - screen (in inches). For each printer in the table "Printer" it is told whether the printer is color or not (color attribute is 'y' for color printers; otherwise it is 'n'), printer type (laser, jet, or matrix), and the price.
Alternatively you can refer here for the schema (Computer Firm)
http://www.sql-ex.ru/help/select13.php#db_1
Now my query is :
Find the makers of the cheapest color printers.
Result set: maker, price.
and I have written the query as:
SELECT prod.maker, prin.* FROM (SELECT MIN(price) AS price FROM printer WHERE color = 'y') AS prin INNER JOIN (SELECT maker, model FROM product) AS prod ON prin.model = prod.model
Which is giving the error "Invalid column name 'model'.". Please help!
Thanks!
Faaz

Hello,
Your query does not work because your subquery prin does not return a column named model.
Analytical functions like Vivek L suggests are the best way to do this, but this one is a correction of your query and should work too (not tested, unfortunately).
SELECT prod.maker, prin2.*
FROM (SELECT MIN(price) AS min_price FROM printer WHERE color = 'y') AS prin
INNER JOIN (SELECT model, price FROM printer WHERE color='y' ) AS prin2 ON prin.min_price = prin2.price
INNER JOIN (SELECT maker, model FROM product) AS prod ON prin2.model = prod.model;Regards,
Sylvie

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