Question

i have the following tables in relation many-to-many:

table product:
prd_cod (pk)
cat_cod (fk)
prd_nome 

table description_characteristic:
prd_cod(fk)
id_characteristic(fk)
description

table characteristic:
id_characteristic(pk)
name

we suppose that the cat_cod will be 1, I would like to show data like this:

I have done this select below to solve my problem:

select p.prd_cod,p.prd_name,c.name_characteristic,dc.description
from product p,description_characteristic dc, characteristic c
where p.prd_cod = dc.prd_cod and
dc.id_ccharacteristic = c.id_characteristic and
p.cat_cod = 1

but the data were shown this way:

Prd_cod  Prd_name   name_characteristic  descript  
  1          pen        Color            pink      
  1          Pen        manufacturer     kingston  
  1          Pen        type                 brush
  1          Pen        weight               0.020

I want to show the result this way:

Prd_cod  Prd_name   name_characteristic  descript  name_characteristic  descript
  1          pen        Color            pink      type                 brush
  2          Pen-drive  manufacturer     kingston  weight               0.020

I can not do a select to solve this
please i need help
Thank you all

Answer 1

Select VALUES YOU WANT
FROM CATEGORIES
LEFT JOIN product ON
product.cat_cod=CATEGORIES.cat_cod
LEFT JOIN description_characteristic ON
product.prd_cod = description_characteristic.prd_cod
LEFT JOIN characteristic ON
description_characteristic.id_characteristic=characteristic.id_characteristic
WHERE CATEGORIES.cat_cod = "1";

You will need to put tablename.column to select fields which exist in more than one table.

(I assumed your categories table was called CATEGORIES)