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POMySQL pivot table query with dynamic columns
 

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    <p>I'm using the following tables for storing product data:</p> <pre><code>mysql&gt; SELECT * FROM product; +---------------+---------------+--------+ | id | name | description | stock | +---------------+---------------+--------+ | 1 | product1 | first product | 5 | | 2 | product2 | second product| 5 | +---------------+---------------+--------+ mysql&gt; SELECT * FROM product_additional; +-----------------+------------+ | id | fieldname | fieldvalue | +-----------------+------------+ | 1 | size | S | | 1 | height | 103 | | 2 | size | L | | 2 | height | 13 | | 2 | color | black | +-----------------+------------+ </code></pre> <p>Using the following query to select the records from both tables</p> <pre><code>mysql&gt; SELECT p.id , p.name , p.description ,MAX(IF(pa.fieldname = 'size', pa.fieldvalue, NULL)) as `size` ,MAX(IF(pa.fieldname = 'height', pa.fieldvalue, NULL)) as `height` ,MAX(IF(pa.fieldname = 'color', pa.fieldvalue, NULL)) as `color` FROM product p LEFT JOIN product_additional AS pa ON p.id = pa.id GROUP BY p.id +---------------+---------------+--------+---------+--------+ | id | name | description | size | height | color | +---------------+---------------+--------+---------+--------+ | 1 | product1 | first product | S | 103 | null | | 2 | product2 | second product| L | 13 | black | +---------------+---------------+--------+---------+--------+ </code></pre> <p>And everything is working correctly :) </p> <p>Because i fill the 'additional' table dynamically it would be nice, if the query would also be dynamic. In that way i dont have to change the query everytime i put in a new fieldname and fieldvalue.</p>
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    1. COpossible duplicate of [MySQL pivot row into dynamic number of columns](http://stackoverflow.com/questions/12004603/mysql-pivot-row-into-dynamic-number-of-columns)
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