Triggers from sybase to oracle giving problem-------urgent please

all the Triggers are got converted to AFTER INSERT/UPDATE/DELETE TRIGGERS IN migration workbench...and almost all are been checking the existence of records in the table ie.,primary key check (existence of record) which if i turn them to BEFORE INSERT is becoming a MUTATING ERROR.
and one more thing the "count(*) from inserted" in sybase equivalent is not there in oracle how to solve this problem?????
if (select count(*) from attr_val av, inserted i
          where av.class_cd = i.class_cd
          and av.attr_cd = i.attr_cd
          and av.attr_val = i.attr_val) >
          ( select count(*) from inserted )
for (select count(*) from inserted) is getting converted to select count(*) from dual
Thanks in advance,
srinivas.

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