Use select in group by statement in Firebird - sql

Question

I'm using a Firebird database which has the following tables:
ARTICULOS
ProductId
longSKU
1
A22121000125
2
A22121000138
3
A22123001508
4
A22124002001
TALLESPORARTICULOS
ProductId
position
Sizes
1
1
Small
1
2
Medium
1
3
Large
1
4
Xtra Large
1
5
XXtra Large
2
1
Small
2
2
Medium
2
3
Large
2
4
Xtra Large
2
5
XXtra Large
3
1
02
3
2
04
3
3
06
3
4
08
and
RANGOSTALLE
ProductId
FromPosition
ToPosition
Price
1
1
3
500
1
4
5
600
2
1
3
500
2
4
5
600
3
1
4
200
I want to be able to group by a substring (shortSKU) of the longSKU and be able to get for each shortSKU the corresponding ranges and prices.
like this example:
ShortSKU
SizeFrom
SizeTo
Price
A221210001
small
large
500
A221210001
xtra large
xxtra large
600
A221230015
02
08
200
I'm using the following cobe but I get the error:
Dynamic SQL Error.
SQL error code = -104.
Invalid expression in the select list (not contained in either an aggregate function or the >GROUP BY clause).
CREATE OR ALTER VIEW RANGOSPARACOSTOSYPRECIOS(
SHORTSKU,
SIZEFROM,
SIZETO,
PRICE ) AS select substring(ar.codigoparticular from 1 for 10) AS SHORTSKU,
( Select TAL.SIZE
From tallesporarticulos TAL
Where TAL.productid=Ar.productid
and TAL.position= RT.FromPosition) as SIZEFROM,
( Select TAL.SIZE
From tallesporarticulos TAL
Where TAL.productid=Ar.productid
and TAL.position= RT.ToPosition) as SIZETO,
max(RT.PRICE)
from Articulos Ar
Inner Join tallesporarticulos TA On Ar.productId = TA.productId
Inner Join rangostalle RT On AR.productId = RT.productId
GROUP BY SHORTSKU, SIZEFROM, SIZETO ;
The following code works, but I need to replace the "fromposition" and "ToPosition" values with the size value like the code above, and that's when I get the error message.
CREATE OR ALTER VIEW RANGOSPARACOSTOSYPRECIOS(
SHORTSKU,
SIZEFROM,
SIZETO,
PRICE ) AS select substring(ar.codigoparticular from 1 for 10) AS SHORTSKU,
RT.FromPosition as SIZEFROM,
RT.ToPosition as SIZETO,
max(RT.PRICE)
from Articulos Ar
Inner Join tallesporarticulos TA On Ar.productId = TA.productId
Inner Join rangostalle RT On AR.productId = RT.productId
GROUP BY SHORTSKU, SIZEFROM, SIZETO ;
For anyone interested in helping, here you have the insert data from the tables above.
CREATE TABLE articulos (
ProductId INTEGER PRIMARY KEY,
LongSKU varchar(12) NOT NULL
);
INSERT INTO articulos VALUES (1, 'A22121000125');
INSERT INTO articulos VALUES (2, 'A22121000138');
INSERT INTO articulos VALUES (3, 'A22123001508');
INSERT INTO articulos VALUES (4, 'A22124002001');
CREATE TABLE TALLESPORARTICULOS (
ProductId INTEGER NOT NULL,
Position INTEGER NOT NULL,
Sizes varchar(12) NOT NULL
);
INSERT INTO TALLESPORARTICULOS (ProductId, position, Sizes) VALUES
(1, 1, 'SMALL'),
(1, 2, 'MEDIUM'),
(1, 3, 'LARGE'),
(1, 4, 'XTRALARGE'),
(1, 1, 'XXTRALARGE'),
(2, 2, 'SMALL'),
(2, 3, 'MEDIUM'),
(2, 4, 'LARGE'),
(2, 5, 'XTRALARGE'),
(2, 5, 'XXTRALARGE'),
(3, 1, '02'),
(3, 2, '03'),
(3, 3, '04'),
(3, 4, '05');
CREATE TABLE RANGOSTALLE (
ProductId INTEGER NOT NULL,
FromPosition INTEGER NOT NULL,
ToPosition INTEGER NOT NULL,
Price double not null
);
INSERT INTO RANGOSTALLE (ProductId,FromPosition,ToPosition,Price) VALUES
(1, 1,3,500),
(1, 4,5,600),
(2, 1,3,500),
(2, 4,5,600),
(3, 1,4,200);

Answer 1

Your script contains quite a few errors. After fixing them the query is rather trivial:
select substring(LongSKU from 1 for 10), low.sizes, high.sizes, avg(price)
from articulos join RANGOSTALLE on articulos.ProductId = RANGOSTALLE.ProductId
join TALLESPORARTICULOS low on RANGOSTALLE.ProductId = low.ProductId and RANGOSTALLE.FromPosition = low.Prodposition
join TALLESPORARTICULOS high on RANGOSTALLE.ProductId = high.ProductId and RANGOSTALLE.ToPosition = high.Prodposition
group by 1,2,3
https://dbfiddle.uk/?rdbms=firebird_3.0&fiddle=ae54a7d897da4604396775e3ddc4b764
This query can be optimized by moving grouping into a derived table but such optimization highly depends on the real table structure and query requirements.