sql - MYSQL : Deleting a row after UPDATE in scheduled event -

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hi have event selects result larger table query is:

update character_data tu, character_data ts  set tu.killsz = ts.killsz  tu.playeruid = ts.playeruid      , tu.numberid < ts.numberid;  numberid  |  playeruid  |  alive  |  killsz    1           555555        0         55    2           555555        1         55

the event simply

1. update character_data tu, character_data ts     set tu.killsz = ts.killsz     tu.playeruid = ts.playeruid         , tu.numberid < ts.numberid; 2. delete character_data     alive = 0     group playeruid     having count(playeruid) > 1;

this line seems not working correctly:

delete character_data  alive = 0  group playeruid  having count(playeruid) > 1;

the wierd thing delete rows alive = 1 not 0.

if this:

delete character_data  alive = 1  group playeruid  having count(playeruid) > 1;

it delete rows alive = 0 every , delete right row. why doing reverse , how can reliable result?

this works:

    delete character_data  playeruid in (select t1.playeruid character_data1 t1 playeruid=t1.playeruid  , killsz=t1.killsz , alive=0  group playeruid having count(*)>1) limit 1

note:

it works when there 2 duplicate records.if have 3 duplicate playerid's , want delete 2 of them should change limit 2 manually.the table character_data1 temporary table created me , cant use same table inside sub-queries when using delete function should create duplicate table task.


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