MySQL query, two tables with order group by - mysql

Question

I have two tables, bills and linesbill. I need all the products that a customer has ever bought. I've gotten this to work:
SELECT referencia, codcliente, pvpunitario, t2.fecha FROM
lineasfacturascli T1
INNER JOIN facturascli T2 ON T1.idfactura = T2.idfactura
WHERE T2.codcliente = "000001"
GROUP BY referencia
But I need get the last price that the customer has paid for each product. I'm trying to order by "fecha"->(date) but it does not work.
Tables structure
facturascli
idfactura(id bill),
codcliente(client id),
fecha(date)
lineasfacturascli
referencia(name of product),
idfactura(id bill)
pvpunitario(price)
Edit
DRapp solution works but I also need to handle the case that a customer buys it in the same day get only the lower price:
With the solution provided the result is:
|Referencia| |MostRecentDatePerItem| |MostRecentPricePerItem|
| pendrive | | 2017-03-02 | | 50 |
| pendrive | | 2017-03-02 | | 10 |
| samsung | | 2017-03-02 | | 50 |
| linux car| | 2017-04-26 | | 9.99 |
I need:
|Referencia| |MostRecentDatePerItem| |MostRecentPricePerItem|
| pendrive | | 2017-03-02 | | 10 |
| samsung | | 2017-03-02 | | 50 |
| linux car| | 2017-04-26 | | 9.99 |
Thanks

Answer 1

I would start with an inner pre-query of all line items for a specific person with a max date per item as a group by. So if a person ordered the 10 things multiple times over say... 50 orders, you would still have the final list of 10 things, but also the most recent date the thing was ordered.
The following is based on not exactly knowing your structures, nor sample data (please provide for future). Also, you should always qualify your table columns in a query with the corresponding table alias reference so users know which field comes from what table. I have to assume the "pvpunitario" column is from the line item details as the price, but basic translation appears to be "unit" not price. You will have to adjust accordingly if I am inaccurate on my impression.
select
T1.referencia,
max( t2.fecha ) as MostRecentDatePerItem
FROM
lineasfacturascli T1
INNER JOIN facturascli T2
ON T1.idfactura = T2.idfactura
WHERE
T2.codcliente = "000001"
GROUP BY
T1.referencia
So this will give us just the products and the maximum date ever ordered by a single client. Now, we take this result as a basis to the original query, re-joined to the line items / order headers that specifically match the corresponding MostRecentDatePerItem.
select
TT1.Referencia,
PQ.MostRecentDatePerItem,
TT1.pvpunitario as MostRecentPricePerItem
from
lineasfacturascli TT1
JOIN
(select
T1.referencia,
max( t2.fecha ) as MostRecentDatePerItem
FROM
lineasfacturascli T1
INNER JOIN facturascli T2
ON T1.idfactura = T2.idfactura
WHERE
T2.codcliente = "000001"
GROUP BY
T1.referencia ) PQ
on TT1.Referencia = PQ.Referencia
JOIN facturascli TT2
ON TT1.idfactura = TT2.idfactura
AND PQ.MostRecentDatePerItem = TT2.Fecha
where
TT2.codcliente = "000001"
To clarify what is going on. The inner query (now alias "PQ" -- PreQuery), is just those qualifying items for the one client in question with the most recent date said item was purchased.
So now back to the original list of all order line items joined to this table keeps the reference product ID linked. Now, we go again to the order header table and still apply the same client code, but ALSO joined on the same FETCHA date as the maximum date found for the transaction. So only THEN do we want to grab the detail level price / unit information for said product.
Hopefully this helps direct your final solution. If I am incorrect on any pieces, you should EDIT your original question and supply the additional missing details / alias references / sample data. Then you can reply comment for follow-up support.
Answer per Comment.
To get the minimum price, you would just adjust the outer select and add a group by. Since the item is the same, the group by will only group for the prices on that specific day. Change the above to...
select
TT1.Referencia,
PQ.MostRecentDatePerItem,
MIN( TT1.pvpunitario ) as LeastPricePerItemOnThisDate
(same rest of query)
GROUP BY
TT1.Referencia,
PQ.MostRecentDatePerItem