SQL query to select products with the same ingredients from other products

Question

I have a database which stores the products available on the market and products, "still under development", in two separate tables ( market_productand dev_product). The third table (substance) contains all the substances from which the product can be made. The other two tables ( marked_product_compand dev_product_comp) Mantegna.

I want to choose products still under development that are made from the same ingredients as the products they sell.

In the following (simplified) example, the query should select a product with ID = 2 from the dev_product table.

CREATE table market_product (ID SERIAL PRIMARY KEY);
CREATE table dev_product (ID SERIAL PRIMARY KEY);
CREATE table substance (ID SERIAL PRIMARY KEY);
CREATE table market_product_comp (prodID SERIAL, substID SERIAL, PRIMARY KEY(prodID,substID));
CREATE table dev_product_comp (devID SERIAL, substID SERIAL, PRIMARY KEY(devID,substID));

INSERT INTO market_product VALUES (1),(2);
INSERT INTO dev_product VALUES (1),(2);
INSERT INTO substance VALUES (1),(2),(3);
INSERT INTO market_product_comp VALUES (1,1),(1,2),(2,3);
INSERT INTO dev_product_comp VALUES (1,2),(2,1),(2,2);

How to write such a request?

---

UPDATE:

Sorry, I didn’t notice that I asked my question ambiguously.

, , . , dev_product, {1,2} market_product, {1,2,3}, dev_product, , , .

Answer 1

MySQL:

SELECT  *
FROM    dev_product dp
WHERE   EXISTS
        (
        SELECT  NULL
        FROM    market_product mp
        WHERE   NOT EXISTS
                (
                SELECT  NULL
                FROM    dev_product_comp dpc
                WHERE   dpc.prodID = dp.id
                        AND NOT EXISTS
                        (
                        SELECT  NULL
                        FROM    market_product_comp mpc
                        WHERE   mpc.prodID = mp.id
                                AND mpc.substID = dpc.substID
                        )
                )
                AND NOT EXISTS
                (
                SELECT  NULL
                FROM    market_product_comp mpc
                WHERE   mpc.prodID = mp.id
                        AND NOT EXISTS
                        (
                        SELECT  NULL
                        FROM    dev_product_comp dpc
                        WHERE   dpc.prodID = dp.id
                                AND dpc.substID = mpc.substID
                        )
                )

        )

PostgreSQL:

SELECT  *
FROM    dev_product dp
WHERE   EXISTS
        (
        SELECT  NULL
        FROM    market_product mp
        WHERE   NOT EXISTS
            (
            SELECT  NULL
            FROM    (
                SELECT  substID
                FROM    market_product_comp mpc
                WHERE   mpc.prodID = mp.ID
                ) m
            FULL OUTER JOIN
                (
                SELECT  substID
                FROM    dev_product_comp dpc
                WHERE   dpc.devID = dp.ID
                ) d
            ON  d.substID = m.substID
            WHERE   d.substID IS NULL OR m.substID IS NULL
            )
        )

COUNT(*): , .

:

• (PostgreSQL, FULL OUTER JOIN)
• MySQL: (MySQL, EXISTS)

Answer 2

, , COUNT() NULL.

SELECT d1.devId, m1.prodId
FROM market_product_comp m1
CROSS JOIN dev_product_comp d1
LEFT OUTER JOIN dev_product_comp d2 
   ON (d2.substId = m1.substId AND d1.devId = d2.devId)
LEFT OUTER JOIN market_product_comp m2 
   ON (d1.substId = m2.substId AND m1.prodId = m2.prodId)
GROUP BY d1.devId, m1.prodId
HAVING COUNT(d1.substId) = COUNT(d2.substId)
   AND COUNT(m1.substId) = COUNT(m2.substId);

MySQL 5.0.75, SQL- ANSI, SQL.

Answer 3

select d.* from dev_product d
 left join dev_product_comp dpc on d.Id = dpc.devId
where dpc.substID in 
  (select mpc.substID from market_product_comp  mpc 
    left join market_product mp on mp.Id = mpc.prodId)

Answer 4

Select only product identifiers in which all commodity substances are used in market products.

select 
   dp.id
from 
   dev_product dp
   inner join dev_product_comp dpc on dp.id = dpc.devid
where 
   dpc.substid in (select substid from market_product_comp) 
group by 
   dp.id
having 
   count() = (select count() from dev_product_comp where devid = dp.id)

Excludes products with ANY ingredients not used in production.