stored procedures - MySQL CREATE TRIGGER, Syntax Error. What I'm doing wrong? -

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 delimiter || create trigger `monthly_insert` before insert on `history_monthly` each row begin     new.`uid` = concat(old.`year`, old.`month`, old.`charactersid`); end; || delimiter ;

and returns error:

#1064 - have error in sql syntax; check manual corresponds mysql server version right syntax use near '.`uid` = concat(old.`year`, old.`month`, old.`charactersid`); end' @ line 4

it's first time triggers , doing best try find soultion failed ;<

you need add word set in line:

set new.`uid` = concat(old.`year`, old.`month`, old.`charactersid`);

also, commenter pointed out, there no old value in before insert trigger.


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