MySQL WHERE & timestamp help

I have a column called "timestamp" in my mysql table, the column type is "datetime":
Example timestamp format: 2011-12-16 16:51:45

I'm trying to write a SELECT query to only select records with a timestamp within the last 20 minutes of the current time.

How would I do this using PHP?

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SharathData EngineerCommented:
try like this.
select *
  from your_table
 where DATE_SUB(curdate(),INTERVAL 20 MINUTE) <= timestamp

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Greg AlexanderLead DeveloperCommented:
The php version could be

// store current date and time
$now = date("Y-m-d H:i:s");
// build a date and time variable twenty minutes in the past
$past = date("Y-m-d H:i:s",strtotime($now. "- 20 minutes"));

$query = "SELECT * FROM table_name WHERE timestamp >= '".$past;

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sky_revolutionAuthor Commented:
Works great, thanks!
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