How to get all similar named records in mysql

Question

I have a table containing data stored like:

product_name | quantity | tert
ASIZ A4 100 FOX | 20| BUYER1
CERVEZA A6 150 FOX | 15| BUYER1
ASIZ A4 150 FOX | 40| BUYER1   
CERVEZA A6 11 FOX | 15| BUYER1
QUINTA A6 150 FOX | 15| BUYER2
ASIZ A4 150 FOX | 33 | BUYER2
ASIZ A6 150 FOX | 15| BUYER2
CERVEZA A6 150 FOX | 15| BUYER2

I want to retrieve all data that matches first word (eg ASIZ ) sum the quantities and display them like:

BUYER1
Asiz - 60 pcs.
Cerveza = 30 pcs.
etc.

BUYER2
Asiz = 48 pcs.
Cerveza = 15 pcs.

etc

at the moment I am using 2 while loops:

SELECT DISTINCT product_name 
FROM my_table 
WHERE buyer_code= '".$bcode."' 
GROUP BY product_name

-- and I get the product names

then

SELECT DISTINCT product_name,tert, SUM(quantity) AS quantity 
FROM my_table 
WHERE buyer_code ='".$bcode."' AND 
      prouct_name LIKE '".$first_word_of_product_name."%' 
GROUP BY tert
ORDER BY data ASC

I get the sums right, but it lists them every time it finds similar named products (eg: BUYER1: ASIZ - 2 times etc.)

it shows:

Buyer1
ASIZ - 60
Cerveza - 30
ASIZ - 60
Cerveza - 30

I know it has something to do with the product_name, but how should I write the sql statement to work? Thanks

Answer 1

SELECT SUBSTRING_INDEX(product_name, '.', 1) product, tert, SUM(quantity) quantity
FROM my_table
GROUP BY product, tert

Answer 2

Remove tert from your second sql and it would work as expected.

Change this to

SELECT DISTINCT product_name,tert, SUM(quantity) AS quantity 
FROM my_table 
WHERE buyer_code ='".$bcode."' 
     AND prouct_name LIKE '".$first_word_of_product_name."%' 
GROUP BY tert 
ORDER BY data ASC

this

SELECT DISTINCT product_name, SUM(quantity) AS quantity 
FROM my_table 
WHERE buyer_code ='".$bcode."' 
     AND prouct_name LIKE '".$first_word_of_product_name."%' 
GROUP BY product_name 
ORDER BY data ASC

Answer 3

Run

SELECT tert, SUBSTRING_INDEX(product_name,' ',1) as product, sum(quantity) as qty
FROM my_table 
GROUP BY tert, product
ORDER BY tert, product

Your results are sorted by tert so ou can walk through one by one showing product and qty and displaying tert every time a tert changes.

UPDATE : A code sample how to output the data (not tested):

$tert = null;
foreach($rows as $row){
    if($rows['tert'] != $tert){
        $tert = $rows['tert'];
        echo $tert;
    }
    echo $row['product'], "-", $row['qty'];
}

here $rows - all fetched rows.