Question

Hello I have a table in some cms (products) that has 3 columns:

product_id feature_id value
1          1          blue
1          8          cotton
2          5          t-shirt
2          1          red
3          8          wool
1          9          large

Each product has its own id, also each product has a list of features
(about 10 of them) each feature_id represent’s a feature. Depending on
the feature_id the “value” column has the value for that type of feature.

E.x. imagine clothes, 1 unique product_id -> 1 cloth -> many features / properites like color type of material price size etc etc.

Question is it possible to fetch 3 rows something like

product_id value1 value2
1          blue   large
2          red    medium
3          green  xsmall
4          purple xlarge

where value1 is the string on the value column when products 1 feature_id = 1 and
value2 is the string on the value column when products 1 feature_id = 9 (feature_id for size)

I cant figure out how to do this in one statement, without having to merge arrays in php.

Answer 1

SELECT DISTINCT product_id AS book_id, (

SELECT value
FROM cscart_product_features_values
WHERE product_id = book_id
AND feature_id =  '1'
) AS publisher, (

SELECT value
FROM cscart_product_features_values
WHERE product_id = book_id
AND feature_id =  '8'
) AS author
FROM  `cscart_product_features_values` 
ORDER BY product_id

Well after some testing this works great 🙂