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    <p>You can use <a href="http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat" rel="noreferrer"><code>GROUP_CONCAT</code></a>:</p> <pre><code>SELECT person_id, GROUP_CONCAT(hobbies SEPARATOR ', ') FROM peoples_hobbies GROUP BY person_id </code></pre> <p>As Ludwig stated in <a href="https://stackoverflow.com/questions/276927/can-i-concatenate-multiple-mysql-rows-into-one-field#comment14513101_276949">his comment,</a> you can add the <code>DISTINCT</code> operator to avoid duplicates:</p> <pre><code>SELECT person_id, GROUP_CONCAT(DISTINCT hobbies SEPARATOR ', ') FROM peoples_hobbies GROUP BY person_id </code></pre> <p>As Jan stated in <a href="https://stackoverflow.com/questions/276927/can-i-concatenate-multiple-mysql-rows-into-one-field#comment72475644_276949">their comment,</a> you can also sort the values before imploding it using <code>ORDER BY</code>:</p> <pre><code>SELECT person_id, GROUP_CONCAT(hobbies ORDER BY hobbies ASC SEPARATOR ', ') FROM peoples_hobbies GROUP BY person_id </code></pre> <p>As Dag stated in <a href="https://stackoverflow.com/questions/276927/can-i-concatenate-multiple-mysql-rows-into-one-field/276949#comment12638055_276949">his comment,</a> there is a 1024 byte limit on the result. To solve this, run this query before your query:</p> <pre><code>SET group_concat_max_len = 2048 </code></pre> <p>Of course, you can change <code>2048</code> according to your needs. To calculate and assign the value:</p> <pre><code>SET group_concat_max_len = CAST( (SELECT SUM(LENGTH(hobbies)) + COUNT(*) * LENGTH(', ') FROM peoples_hobbies GROUP BY person_id) AS UNSIGNED ) </code></pre>
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    1. COJust be aware of the limitation of 1024 bytes in the resulting column (see parameter [group_concat_max_len](http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_group_concat_max_len))
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    2. COAnd adding the `DISTINCT` parameter, you will not get any doubles. `... GROUP_CONCAT(DISTINCT hobbies)`
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