Question

it is possible to get only one row per record in a multitable query?

I have this three tables:

APPLES

ID | APPLE
----------
1  | RED
2  | YELLOW
3  | GREEN

FARMS

ID  | FARM
--------------------
B1  | GEORGE'S FARM
B2  | JOHN'S FARM

FARM_APPLES

FARM  | APPLE
---------------
B1    | 1
B1    | 2
B1    | 3
B2    | 1
B3    | 3

With this tables I need this result:

FARM_NAME | APPLE_1 | APPLE_2 | APPLE_3
----------------------------------------
B1        | 1       | 2       | 3
B2        |1        |         | 3

Any help is much appreciated, thanks in advance.

EDIT

Thanks both OMG Ponies and Bill, I’ll try both of your solutions, just one last thing, its possible to get this result:

FARM          | RED | YELLOW | GREEN
-------------------------------------
GEORGE'S FARM | YES |  YES   |  YES
JOHN's FARM   | YES |  NO    |  YES

Answer 1

Firebird 2.0 supports the CASE expression, so you can use:

  SELECT fa.farm AS farm_name,
         MAX(CASE WHEN fa.apple = 1 THEN fa.apple ELSE NULL END AS apple_1,
         MAX(CASE WHEN fa.apple = 2 THEN fa.apple ELSE NULL END AS apple_2,
         MAX(CASE WHEN fa.apple = 3 THEN fa.apple ELSE NULL END AS apple_3,
    FROM FARM_APPLES fa
GROUP BY fa.farm