Max ID join sql

Question

I have three sql tables,

1) Commandes, 2) Ligne_commande, 3) Produits.

commandes is linked with ligne_commande and ligne_commande is linked to produits.

Commandes : CMD_ID
Produits : PRD_ID
Ligne Commande : LGCM_CMD_ID, LGCM_PRD_ID

CMD_ID = LGCM_CMD_ID
LGCM_PRD_ID = PRD_ID

i'm getting this result :

(29) - 028001 - AC 1ERES C.DE BLAYE. CH L.BERTRANDS     1   

(30) - 028001 - AC 1ERES C.DE BLAYE. CH L.BERTRANDS     7   

(31) - 028001 - AC 1ERES C.DE BLAYE. CH L.BERTRANDS     7

I want to show only the last LGCM_ID , i tried to use MAX (LGCM_ID) but when i used it, i got (31) - 028001 - AC 1ERES C.DE BLAYE. CH L.BERTRANDS (31) - 028001 - AC 1ERES C.DE BLAYE. CH L.BERTRANDS but the value 1 not 7 for the quantity ordered... (LGCM_QTE_COMMANDE)

I need that because i want to show the products that the consummer has already ordered before.

<?php

foreach ($query=$db->query("SELECT
t1.CMD_ID, CMD_DATE, t1.CMD_CLT_ID,
MAX(t2.LGCM_ID) AS LGCM_LAST_ID, t2.LGCM_CMD_ID, t2.LGCM_PRD_ID, t2.LGCM_QTE_COMMANDE,
t3.PRD_ID, t3.PRD_CODE, t3.PRD_LIBELLE
FROM commandes t1
INNER JOIN ligne_commande t2
ON t1.CMD_ID = t2.LGCM_CMD_ID
LEFT OUTER JOIN produits t3
ON t2.LGCM_PRD_ID = t3.PRD_ID WHERE t1.CMD_CLT_ID = 418") AS $donnees):

echo '<tr>';
echo '<td>('.$donnees['LGCM_LAST_ID'].') - '.$donnees['PRD_CODE'].' - '.$donnees['PRD_LIBELLE'].'</td>';
echo '<td>/</td>';
echo '<td>'.$donnees['LGCM_QTE_COMMANDE'].'</td>';
echo '<td>/</td>';
echo '</tr>';

endforeach;

?>

Thanks.

EDIT : Look this picture :

I want to show only the number 38, 37, 36. It's the last product that the consummer ordered.

Answer 1

Just ORDER BY your LGCM_ID DESC and limit your results to 1 record, which in mysql is LIMIT 1

Since I don't have your original query that returns 3 records, I can only give you the above recommendation. But use that query with those two additions that I specified and you should be good to go.

EDIT: The question has been updated. So what you really want to do is get the last order id for each product ordered by a particular customer.

To do that, see this JS Fiddle Example

SELECT cp.*, p.Name
FROM Products p
INNER JOIN Customer_Products cp ON cp.P_ID = p.ID
INNER JOIN 
  (SELECT MAX(cp.ID) AS Max_ID
  FROM Customer_Products cp
  WHERE cp.C_ID = 1
  GROUP BY cp.P_ID)
AS t0 ON t0.Max_ID = cp.ID;

The t0 INNER JOIN gets you the maximum ID of the order for each product ordered by a customer, which is achieved through the GROUP BY cp.P_ID statement. Then, given that max id, we join back to the Customer_Products to get details from that order, such as the QTY ordered. And working up one more level, we join to Products so we can get the product name.