 Oracle?  Oracle6 ,    ( ,  -  ),     .           ,    (language_code, emp#)      (emp#, language_code).
          skill_code,     languages_spoken          .          ( )    ,       .
 OracleS         -. , ,      .    ,   ,  ,       Oracle  -    -.          ,       ,      ,     ,   -     (       ).
  ,      :
CREATE TABLE part__usage
( used_by_part# NUMBER(8,0) NOT NULL
, used_in_part# NUMBER(8,0) NOT NULL
, quantity_used NUMBER(8,0) NOT NULL
, PRIMARY KEY (used_by_part#, used_in_partt)
i ;
      ,  75%      .         25%     ,       (, ,   25%   )     . ,   ,   ?
 ,         .        ,    ,     .     ,      (   ,   -        SQL*Loader,   INSERT APPEND).      part_usage,    :
CREATE TABLE part_usage
( used_by_part# NUMBER(8,0) NOT NULL
4.  ""  OracleS	67