MYSQL: AND statement causing expected results to not display [duplicate] - mysql

Question

This question already has answers here:
MySQL query finding matches across multiple rows
(2 answers)
MySQL query to search multiple attributes and value_id
(1 answer)
Closed 3 years ago.
When I run the below query, I expect to get one result.
However, I get no results.
SELECT listings.*
FROM `listings`
LEFT JOIN users
ON listings.user_id = users.user_id
LEFT JOIN listing_attributes
ON listings.listing_id = listing_attributes.listing_id
WHERE users.account_status = 1
AND ( listing_attributes.name LIKE 'collection_city' AND listing_attributes.content LIKE '%d%' )
AND ( listing_attributes.name LIKE 'collection_post_code' AND listing_attributes.content LIKE '%e%' )
GROUP BY listings.listing_id
I have identified the problem as these two lines
AND ( listing_attributes.name LIKE 'collection_city' AND listing_attributes.content LIKE '%d%' )
AND ( listing_attributes.name LIKE 'collection_post_code' AND listing_attributes.content LIKE '%e%' )
If I remove either of the lines, I get the result I expect.
I am thinking something is wrong with the way I am encompassing the results in the ().
In essence I am wishing to check that multiple values exist in listing_attributes for a result to be as needed.

Answer 1

I think that your logic is not correct. You must use the operator OR for this condition. Otherwise the condition will be false.
{
( listing_attributes.name LIKE 'collection_city' AND listing_attributes.content LIKE '%d%' )
OR ( listing_attributes.name LIKE 'collection_post_code' AND listing_attributes.content LIKE '%e%' )
}

Answer 2

Please use below query, Try moving the condition to on clause
SELECT listings.*
FROM `listings`
LEFT JOIN users
ON listings.user_id = users.user_id AND users.account_status = 1
LEFT JOIN listing_attributes
ON listings.listing_id = listing_attributes.listing_id AND ( listing_attributes.name LIKE 'collection_city' AND listing_attributes.content LIKE '%d%' ) AND ( listing_attributes.name LIKE 'collection_post_code' AND listing_attributes.content LIKE '%e%' )
GROUP BY listings.listing_id;

Answer 3

Given that listings.listing_id is a key of listings you can use a HAVING clause checking for the sums of the logical expressions are greater then 0. This works because logical expressions in numeric context evaluate to 0 or 1 in MySQL.
Your join with user silently becomes an inner join because of the WHERE as NULLs cannot equal 1. Since the NULLs from the left join of listing_attributes cannot make the HAVING clause true you can also convert that join to an inner join.
SELECT listings.*
FROM listings
INNER JOIN users
ON listings.user_id = users.user_id
INNER JOIN listing_attributes
ON listings.listing_id = listing_attributes.listing_id
WHERE users.account_status = 1
GROUP BY listings.listing_id
HAVING sum(listing_attributes.name LIKE 'collection_city'
AND listing_attributes.content LIKE '%d%') > 0
AND sum(listing_attributes.name LIKE 'collection_post_code'
AND listing_attributes.content LIKE '%e%') > 0;