Sql statement with multi ANDs querying the same column - sql

Question

I don't know if the title of the post is the appropriate. I have the following table
and an Array in php with some items, parsed_array. What I want to do is to find all the SupermarketIDs which have all the items of the parsed_array.
For example, if parsed_array contains [111,121,131] I want the result to be 21 which is the ID of the Supermarket that contains all these items.
I tried to do it like that:
$this->db->select('SupermarketID');
$this->db->from('productinsupermarket');
for ($i=0; $i<sizeof($parsed_array); $i++)
{
$this->db->where('ItemID', $parsed_array[$i]);
}
$query = $this->db->get();
return $query->result_array();
If there is only one item in the parsed_array the result is correct because the above is equal to
SELECT SupermarketID
FROM productinsupermarket
WHERE ItemID=parsed_array[0];
but if there are more than one items, lets say two, is equal to
SELECT SupermarketID
FROM productinsupermarket
WHERE ItemID=parsed_array[0]
AND ItemID=parsed_array[1];
which of course return an empty table. Any idea how can this be solved?

Answer 1

There are at least two ways of generating the result you want, either a self join (no fun to generate with a dynamic number of items) or using IN, GROUP BY and HAVING.
I can't really tell you how to generate it using CodeIgniter, I assume you're better at that than I am :)
SELECT SupermarketID
FROM productinsupermarket
WHERE ItemID IN (111,121,131) -- The 3 item id's you're looking for
GROUP BY SupermarketID
HAVING COUNT(ItemId) = 3; -- All 3 must match
An SQLfiddle to test with.
EDIT: As #ypercube mentions below, if the ItemId can show up more than once for a SupermarketID, you'll want to use COUNT(DISTINCT ItemId) to count only unique rows instead of counting every occurrence.

Answer 2

You can use where_in in codeigniter as below,
if(count($parsed_array) > 0)
{
$this->db->where_in('ItemID', $parsed_array);
}
Active record class in codeigniter

Answer 3

Try an IN clause or multiple ORs:
SELECT SupermarketID
FROM productinsupermarket
WHERE ItemID=parsed_array[0]
OR ItemID=parsed_array[1];