Question

so there is a table of parameters which is associated with the "offer". The parameters table looks like this:

• offer_id
• parameter_name
• parameter_value

Table entries look like this:

offer_id | parameter_name | parameter_value

1 | price | 100

1 | width | 150

1 | height | 200

1 | place | left

1 | place | right

2 | price | 300

2 | width | 150

2 | height | 200

Now I want to perform a search using MySQL query in this table, where

• price is more than 80 AND less than 120
• width is equal to 150
• height is equal to 200
• place is either left OR right

The expected outcome:

• offer_id = 1

How would a MySQL query look like?

Thanks a lot.

Answer 1

Something like this:-

SELECT *
FROM offers a
INNER JOIN offers b ON a.offerid = b.offerid
INNER JOIN offers c ON b.offerid = c.offerid
INNER JOIN offers d ON c.offerid = d.offerid
WHERE a.parameter_name = 'price'
AND b.parameter_name = 'width'
AND c.parameter_name = 'height'
AND d.parameter_name = 'place'
AND a.parameter_value BETWEEN 80 AND 120
AND b.parameter_value = '150'
AND c.parameter_value = '200'
AND d.parameter_value IN ('left','right')

Note that this will bring back multiple rows sometimes (ie id of 1 would come back more than once). You can remove this with a DISTINCT if you want. Depends how the data is to be used.