mySQL query needed: find an ID where two (meta_key) rows match

there's one meta table   tblOrdersMeta   with various meta_keys per orderitem_ID

tableID    orderitem_ID   meta_key     meta_value
     1               10                    productID        123
     2               10                    orderID             456

what is the query to find the orderitem_ID  (ex: 10)   that has in common  productID=123   and    orderID=456
(tableID is irrelevant for the end result)

(i can put in the appropriate PHP variables etc)
willsherwoodAsked:
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GaryConnect With a Mentor Commented:
http://sqlfiddle.com/#!2/b0050/1

SELECT t1.orderitem_ID from tblOrdersMeta t1
inner join tblOrdersMeta t2
ON t1.orderitem_ID=t2.orderitem_ID
where t1.meta_key='productID' 
AND t1.meta_value=123
AND t2.meta_key='orderID' 
AND t2.meta_value=456

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Dave BaldwinFixer of ProblemsCommented:
If you know the orderitem_ID, then this.

SELECT * FROM tblOrdersMeta WHERE orderitem_ID = 10;

If not then you need to do a query on one of the other items to get it.
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Dan CraciunConnect With a Mentor IT ConsultantCommented:
Try this (untested):
SELECT orderitem_ID FROM 
(
(SELECT orderitem_ID, meta_key, meta_value FROM tblOrdersMeta 
WHERE meta_key = 'productID' AND meta_value = '123') t1
JOIN 
(SELECT orderitem_ID, meta_key, meta_value FROM tblOrdersMeta 
WHERE meta_key = 'orderID' AND meta_value = '456') t2
ON t1.orderitem_ID=t2.orderitem_ID
)

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The idea is to select all the rows with productID=123, then all the rows with orderID=456, then INNER JOIN them together on orderitem_ID, which will give you all the common orderitem_ID.

HTH,
Dan
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willsherwoodAuthor Commented:
orderitemID is what i'm looking for.
something like:

WHERE
      (select orderitemID FROM...  WHERE   meta_key='productID' AND meta_value=123 )
=
      (select orderitemID FROM...  WHERE   meta_key='orderID' AND     meta_value=456 )
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willsherwoodAuthor Commented:
Dan - i'll give it a try (my reply to Dave crossed paths)
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Ray PaseurConnect With a Mentor Commented:
If you want to get a little bit of PHP into the mix you might try this strategy.

1. SELECT orderitem_id and create an array of all of them.
2. Use array_not_unique() to find the replicants.
3. Iterate over the replicants to SELECT the rows with replicated orderitem_id values.

<?php // demo/array_not_unique.php
error_reporting(E_ALL);
echo "<pre>";

// A FUNCTION TO FIND REPLICATED VALUES IN AN ARRAY
function array_not_unique($raw)
{
    // MAN PAGE: http://php.net/manual/en/function.array-count-values.php
    $new = array_count_values($raw);
    foreach ($new as $key => $val)
    {
        if ($val < 2) unset($new[$key]);
    }
    return $new;
}


// SOME TEST DATA
$raw_array   = array();
$raw_array[] = 'abc@xyz.com';
$raw_array[] = 'def@xyz.com';
$raw_array[] = 'ghi@xyz.com';
$raw_array[] = 'jkl@xyz.com';
$raw_array[] = 'mno@xyz.com';
$raw_array[] = 'pqr@xyz.com';
$raw_array[] = 'stu@xyz.com';

// SOME DUPLICATES
$raw_array[] = 'abc@xyz.com';
$raw_array[] = 'jkl@xyz.com';
$raw_array[] = 'abc@xyz.com';
$raw_array[] = 'def@xyz.com';


// SHOW THE FUNCTION AT WORK
$common = array_not_unique($raw_array);
foreach ($common as $x => $n)
{
    echo PHP_EOL . "THE VALUE $x APPEARED $n TIMES";
}

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willsherwoodAuthor Commented:
thanks all!
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