Use table aliases when using the same table in a correlated sub-query: 
SELECT u1.uptime_id as uid, u1.uptime_value
  FROM uptime u1
 WHERE u1.uptime_value > (SELECT u2.uptime_value
                          FROM uptime u2
                          WHERE u2.uptime_id = u1.uptime_id+1);

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In reply to Re: OT: peak values with SQL by runrig
in thread OT: peak values with SQL by revdiablo

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