How can I update a field in a MySQL database table by addition in MySQL database in a single query

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Published on 2010-04-27T12:31:02Z Indexed on 2010/04/27 12:33 UTC
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mysql

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query

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update

I have a table that stores a value that will be added to over time. When I want to add to the value I would like to do so in a single query rather than -

Get oldValue from database
newValue = oldValue + X
update row with newValue

$query1 = "SELECT value FROM table WHERE id = thisID"; $result1 = mysql_query($query1); while($row=mysql_fetch_array($result)) { $oldValue = $row['value']; } $newValue = $oldValue + x $query1 = "UPDATE table SET value = $newValue WHERE id = thisID";

Can this be done in a single query?

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