Matching all values in IN clause - mysql

Question

Is there a way to ensure all values in an IN clause are matched?
Example:
I can use IN as: IN (5,6,7,8).
I need it to work like an AND across multiple rows.
UPDATE:
I need this to list companies from db that fit specified parameters. Companies and taxonomy are MANY TO MANY relation. I'm using Yii framework. And this is the code of my controller:
public function actionFilters($list)
{
$companies = new CActiveDataProvider('Company', array(
'criteria' => array(
'condition'=> 'type=0',
'together' => true,
'order'=> 'rating DESC',
'with'=>array(
'taxonomy'=>array(
'condition'=>'term_id IN ('.$list.')',
)
),
),
));
$this->render('index', array(
'companies'=>$companies,
));
}

Answer 1

You can do something like this:
select ItemID
from ItemCategory
where CategoryID in (5,6,7,8) <-- de-dupe these before building IN clause
group by ItemID
having count(distinct CategoryID) = 4 <--this is the count of unique items in IN clause above
If you provide your schema and some sample data, I can provide a more relevant answer.
SQL Fiddle Example
If you want to find the items that have all of a specific set of CategoryIDs and no others, this is one way you can approach it:
select a.ItemID
from (
select ItemID, count(distinct CategoryID) as CategoryCount
from [dbo].[ItemCategory]
where CategoryID in (5,6,7,8)
group by ItemID
having count(distinct CategoryID) = 4
) a
inner join (
select ItemID, count(distinct CategoryID) as CategoryCount
from [dbo].[ItemCategory]
group by ItemID
) b on a.ItemID = b.ItemID and a.CategoryCount = b.CategoryCount
SQL Fiddle Example
If you prefer, you could do it with a subquery:
select ItemID
from ItemCategory
where ItemID in (
select ItemID
from ItemCategory
where CategoryID in (5,6,7,8)
group by ItemID
having count(distinct CategoryID) = 4
)
group by ItemID
having count(distinct CategoryID) = 4
SQL Fiddle Example

Answer 2

SELECT ItemID
FROM ItemCategory
WHERE (
(CategoryID = 5) OR
(CategoryID = 6) OR
(CategoryID = 7) OR
(CategoryID = 8)
)
GROUP BY ItemID
HAVING COUNT(DISTINCT CategoryID) = 4