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myRow myCursor%rowtype;
begin
open myCursor;
loop
fetch myCursor into myRow;
exit when myCursor%notfound;
--ÒªÖ´ÐеÄSQLÓï¾ä
end loop;
end;
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alter table t_att_over_haul_safe_pres add c clob;
update t_att_over_haul_safe_pres set c=prt_precautions;
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