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POMysql duplecating results
 

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  1. POMysql duplecating results
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    <p>I'm making a invoice script but my query is returning al my entries mulpiple times when i fetch them. </p> <p>this is my code:</p> <pre><code>$query = " SELECT d.Quantity, d.ProductID, p.ProductName, d.UnitPrice, d.Discount FROM customers AS c, orders AS o, order_details AS d, products AS p WHERE o.OrderID = '10248' AND o.OrderID = d.OrderID AND d.ProductID = p.ProductID "; $result = mysql_query($query); $table = ''; while($row = mysql_fetch_assoc($result)){ $table .= '&lt;tr&gt;'; $table .= '&lt;td&gt;' . $row['Quantity'] . '&lt;/td&gt;'; $table .= '&lt;td&gt;' . $row['ProductID'] . '&lt;/td&gt;'; $table .= '&lt;td&gt;' . $row['ProductName'] . '&lt;/td&gt;'; $table .= '&lt;td&gt;' . $row['UnitPrice'] . '&lt;/td&gt;'; $table .= '&lt;td&gt;' . $row['Discount'] . '&lt;/td&gt;'; $table .= '&lt;td&gt;' . (100 - $row['Discount']) / 100 * $row['UnitPrice'] . '&lt;/td&gt;'; $table .= '&lt;/tr&gt;'; } </code></pre> <p>this is, a part, of what it returns.</p> <pre><code>Quantity ProductID ProductName UnitPrice Discount Subtotal 12 11 Queso Cabrales 14.0000 0 14 10 42 Singaporean Hokkien Fried Mee 9.8000 0 9.8 5 72 Mozzarella di Giovanni 34.8000 0 34.8 12 11 Queso Cabrales 14.0000 0 14 10 42 Singaporean Hokkien Fried Mee 9.8000 0 9.8 5 72 Mozzarella di Giovanni 34.8000 0 34.8 12 11 Queso Cabrales 14.0000 0 14 10 42 Singaporean Hokkien Fried Mee 9.8000 0 9.8 5 72 Mozzarella di Giovanni 34.8000 0 34.8 12 11 Queso Cabrales 14.0000 0 14 10 42 Singaporean Hokkien Fried Mee 9.8000 0 9.8 5 72 Mozzarella di Giovanni 34.8000 0 34.8 </code></pre> <p>while it sould only return 3 entries.</p> <p>anny toughts?</p>
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    1. This table or related slice is empty.
    1. COLearn how to join multiple tables. There are many ways of how joins can be performed, one way (yours) is to combine each element with each other and vice-versa (Cross-Table or Cross-Join, also Cartesian-Join for missing joins), that's why you get that many results. See [Using MySQL, Joins](http://www.keithjbrown.co.uk/vworks/mysql/mysql_p5.php)
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