delete code in trigger throwing up errors oracle -

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i don't know how code throws errors. compiles correctly when used throws error.

create or replace trigger trg_applications before insert or update of app_id, status_id on applications each row begin  :new.app_id := seq_app_id.nextval; :new.app_date := sysdate;  if updating , ( :new.status_id = 2 or :new.status_id = 5 or :new.status_id = 7 or :new.status_id = 8 )    insert app_history (srn, status_id, app_date)    values (:old.srn, :old.status_id, :old.app_date);                delete applications    :new.status_id = 2;        delete applications    :new.status_id = 5;        delete applications    :new.status_id = 7;        delete applications    :new.status_id = 8;  end if;  end;

this error message 

error ora-04091: table apex514.applications mutating,  trigger/function may not see ora-06512: @ "apex514.trg_applications",  line 14 ora-04088: error during execution of trigger 'apex514.trg_applications'

the cause of mutating table error misuse of triggers. here typical example: 1.you insert row in table a

2.a trigger on table (for each row) executes query on table a, example compute summary column

3.oracle throws ora-04091: table mutating, trigger/function may not see it

source further reading. http://dba.stackexchange.com/questions/5432/what-are-the-causes-and-solutions-for-mutating-table-errors


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