CODEWITHSUNDEEP
sqlmysqlmany-to-many
Ken
Ken

Reputation: 393

SQL many to many select

category_product
---------------
id_category
id_product

product
---------------
id_product
id_manufacturer

manufacturer
---------------
id_manufacturer
name

How would I create an SQL query so that it selects all the names from manufacturer when id_category is equal to something?

Upvotes: 36

Views: 79254

Answers (5)

Gcr
Gcr

Reputation: 1

SELECT m.name, cp.id_category
FROM manufacturer AS M INNER JOIN product AS P
    ON M.id_manufacturer = M.id_manufacturer
 INNER JOIN category_product AS CP
    ON P.id_product = CP.id_product 
WHERE cp.id_category = 'add value'

Upvotes: -2

CooL i3oY
CooL i3oY

Reputation: 800

Select M.name
From   manufacturer M
Where  M.id_manufacturer in ( Select P.id_manufacturer
                              From   product P
                              Where  P.id_product in ( Select C.id_product
                                                       From   category_product C
                                                       Where  C.id_category = ?))

Upvotes: 4

YoK
YoK

Reputation: 14505

Query without joins will look like following :

SELECT m.name 
FROM manufacturer as m, product as p, category_product as cp 
WHERE cp.id_category = <your value>
      AND cp.id_product = p.id_product 
      AND p.id_manufacturer = m.id_manufacturer

Upvotes: 15

chryss
chryss

Reputation: 7519

It's a straightforward inner join of the tables:

SELECT m.name, cp.id_category
FROM manufacturer as m
INNER JOIN product as p
    ON m.id_manufacturer = p.id_manufacturer
INNER JOIN category_product as cp
    ON p.id_product = cp.id_product
WHERE cp.id_category = 'some value'

Upvotes: 56

Adriaan Stander
Adriaan Stander

Reputation: 166346

Try something like

SELECT  m.*
FROM      category_product cp INNER JOIN
           product p ON cp.id_product = p.id_product INNER JOIN
           manufacturer m ON p.id_manufacturer = m.id_manufacturer
WHERE      cp.id_category = <your_value>

Upvotes: 0

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