> Is there anyway to combine these 2 queries into 1?
Is this what you mean?
-- list all prods-cats
SELECT p.prod_id, c.category
FROM product_table p
LEFT JOIN catproduct_table cp ON cp.product_id = p.product_id
JOIN product_table p ON p.product_id = cp.product_id;
... or this ...
-- group cats for prods
SELECT p.prod_id, GROUP_CONCAT(c.category)
FROM product_table p
LEFT JOIN catproduct_table cp ON cp.product_id = p.product_id
JOIN product_table p ON p.product_id = cp.product_id
GROUP BY p.prod_id ;
PB
webtek2001-mysql@stripped wrote:
Hi,
I'm currently using 2 queries to obtain some data and would like to know if I can
combine these two queries into one query.
I have a database with 3 tables:
1. A category table
2. A product table
3. A normalized "catproduct" table that is used to determine which product is in which
category. A product may be in multiple categories.
I have a website where when a person navigates to a category it shows all the products. I
would like to create a "related categories" list by finding all the categories the
products in the current category belong to.
Right now I use 2 SQL statements:
1. The first query gets all the products in the current category.
SELECT product_table.prod_id FROM
product_table
LEFT JOIN catproduct_table ON (catproduct_table.product_id =
product_table.product_id)
WHERE (catproduct_table.category_id = '1') LIMIT 5
2. The second query gets all the categories that these products belong to:
SELECT category_table.category FROM category_table
LEFT JOIN catproduct_table ON (catproduct_table.category_id =
category_table.category_id)
LEFT JOIN product_table ON (product_table.product_id = catproduct_table.product_id)
WHERE product_table.prod_id IN ('1000,1001,1002,1003,1004')
These two queries are my proof of concept so I'm only limiting the first query to 5
results. In reality I have thousands of products per category so I prefer not to limit
the first query. I don't have many categories so the results of the second query are
quite small.
Is there anyway to combine these 2 queries into 1?
Thanks,
Mason
http://www.retailretreat.com
webtek2001-mysql@stripped wrote:
> Hi,
>
> I'm currently using 2 queries to obtain some data and would like to know if I can
> combine these two queries into one query.
>
> I have a database with 3 tables:
>
> 1. A category table
> 2. A product table
> 3. A normalized "catproduct" table that is used to determine which product is in
> which category. A product may be in multiple categories.
>
> I have a website where when a person navigates to a category it shows all the
> products. I would like to create a "related categories" list by finding all the
> categories the products in the current category belong to.
>
> Right now I use 2 SQL statements:
>
> 1. The first query gets all the products in the current category.
>
> SELECT product_table.prod_id FROM
> product_table
> LEFT JOIN catproduct_table ON (catproduct_table.product_id =
> product_table.product_id)
> WHERE (catproduct_table.category_id = '1') LIMIT 5
>
> 2. The second query gets all the categories that these products belong to:
>
> SELECT category_table.category FROM category_table
> LEFT JOIN catproduct_table ON (catproduct_table.category_id =
> category_table.category_id)
> LEFT JOIN product_table ON (product_table.product_id =
> catproduct_table.product_id)
> WHERE product_table.prod_id IN ('1000,1001,1002,1003,1004')
>
>
> These two queries are my proof of concept so I'm only limiting the first query to 5
> results. In reality I have thousands of products per category so I prefer not to limit
> the first query. I don't have many categories so the results of the second query are
> quite small.
>
> Is there anyway to combine these 2 queries into 1?
>
> Thanks,
> Mason
>
> http://www.retailretreat.com
>
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