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how to combine these two queries?

Author

Topic

dotolee
Starting Member

9 Posts

Posted - 2013-02-18 : 20:44:15

Hi there. I have to combine these two queries into one using a join:


SELECT categories.category_id, categories.title, categories.description,categories.parent_id,categories.display_weight,
categories.image_thumb, categories.deleted, categories.image_banner,
FROM categories 
WHERE 
AND parent_id=18
AND category_id <> 18

And here's the second one:


SELECT `product.product_id`, `product.name`, `product.image_thumb`, `product.deleted` 
FROM (`product`) 
WHERE `product_id` IN (select product_id from product_category where category_id=18) 
ORDER BY `display_weight` DESC

A few points:

It's possible to have a scenario where the first query will return 0 rows, but the second does contain records.

Also, you'll notice that the second query has a subquery baked in. The relationship between the product table and category table is defined in the product_category table.
The product table on its own doesn't know which categories the products belong to.

Any help would be appreciated.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-02-19 : 00:12:34

[code]
SELECT p.product_id, p.name, p.image_thumb, p.deleted ,
c.category_id, c.title, c.description,c.parent_id,c.display_weight,
c.image_thumb, c.deleted, c.image_banner
FROM product p
JOIN product_category pc
ON pc.product_id = p.product_id
LEFT JOIN categories c
ON c.parent_id = ps.category_id
AND c.category_id <> ps.category_id
ORDER BY p.display_weight DESC
[/code]

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SQL Server MVP
http://visakhm.blogspot.com/

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