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    <p>You can generate a query like this:</p> <pre><code>UPDATE tasks_tbl SET task=1 WHERE (user_id=16 AND date='2010-05-05') OR (user_id=17 AND date='2010-02-22') </code></pre> <p>There are hacks to avoid using <code>(... and ...) or (... and ...)</code> constructs (concatenate fields and params: <code>"concat(user_id, date) = '". $user_id. $date. "'"</code>, but they work a bit slower.</p> <p>The PHP code:</p> <pre><code>for ($i = 0; !empty($_POST['update'. $i]; $i++) if (intval($_POST['task'.$i]) == 1) $cond[] = '(user_id='. intval($_POST['user_id'. $i]). ' and date=\''. mysql_real_escape_string($_POST['date'.$i]). '\')'; $query = 'UPDATE tasks_tbl SET task=1 WHERE '. implode(' OR ', $cond). ')'; </code></pre> <p><strong>Edit:</strong> I don't quite understand why you need to do that in a single query. How many values <code>task</code> can have? 1, 2, 3, or many more? With 3 values, you can use nested <code>IF(...)</code> functions:</p> <pre><code>UPDATE tasks_tbl SET task=if('. &lt;imploded tasks with value 1&gt;. ', 1, if('. &lt;tasks with value 2&gt;. ', 2, if('. &lt;tasks with 3&gt;. ', 3, task))) /* leave as is otherwise */ </code></pre> <p>Or you may put a simple loop on the code I've given:</p> <pre><code>for ($j = 1; $j &lt;= 3; $j++) for ($i = 0; !empty($_POST['update'. $i]; $i++) if (intval($_POST['task'.$i]) == 1) $cond[] = '(user_id='. intval($_POST['user_id'. $i]). ' and date=\''. mysql_real_escape_string($_POST['date'.$i]). '\')'; mysql_query('UPDATE tasks_tbl SET task=1 WHERE '. implode(' OR ', $cond). ')'); </code></pre>
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    1. POHow do I update multiple records in a table with a single MySQL query?
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    1. COAssuming task is always set to 1..
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    2. COOoops! Thanks, fixed that :)
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