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eventTime datetime
eventStat smallint
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eventTime          eventStat
-------------------  -----------
2010-02-25 20:30:00            0
2010-02-25 21:00:00            0
2010-02-25 21:30:00            0

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        EVERY 1 SECOND
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......
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CREATE EVENT test
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        EVERY 1 SECOND
      DO
        BEGIN

select @s := field1 from tableName where eventTime = (now() + INTERVAL 5 minute);
update tableName set eventStat = 1 where field1= @s;
        END
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