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we have a database where we store computer parts and we use these parts to build systems this is what i need to know say i have somthen like this

video card x 10
mobo        x 5
Ram        x 7
Hdd          x 9

no by looking at this i can see that i can make 5 systems but i was a php script that compares up to 10 compoments and tells me how many i can make can some one help me with this?
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Assuming 1 of each per system

$parts = array(
        'video card' => 10,
        'mobo'      => 5,
        'Ram'        => 7,
        'Hdd'        => 9

echo min($parts);    // --> 5

Or, direct from DB,
$sql = "SELECT MIN(qty) FROM parts";
$res = mysql_query($sql);
echo mysql_result ($res, 0, 0);
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