timestamp calculations

From: Steve Leibel <stevel(at)bluetuna(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: timestamp calculations
Date: 2001-01-25 23:14:58
Message-ID: v04210122b69663a58cdd@[24.168.80.161]
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Hello,

I'm converting a mysql db to postgres and ran into this line of code:

$SQL = "select username from users where user_id = ? AND session = ?
AND ADDDATE(last_login, INTERVAL 30 MINUTE)>CURRENT_TIMESTAMP()

How do I implement adddate to get this kind of funcionality?

Thanks,

Steve Leibel

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