    Oracle?    OracleS,      .  OracleS   INSTEAD OF,    UNION ALL      .        ,           ,    OracleS,   ,     (,          ).
        ,  ,    ,    .         :
CREATE TABLE calls
( call_from     NUMBER(12)
, call_to      NUMBER(18)
, call_start    DATE
, call_seconds  NUMBER(6) --       
, PRIMARY_KEY (call_start, call_from)
)
STORAGE (INITIAL 100M NEXT 100M) LOGGING
PARTITION BY RANGE (call_start)
( PARTITION calls__old VALUES LESS THEN ( ' Ol-JAN-98 ' ) TABLESPACE ts97
, PARTITION calls9801 VALUES LESS THEN ('Ol-FEB-98') TABLESPACE ts98
, PARTITION calls9802 VALUES LESS THEN ('Ol-MAR-98')
TABLESPACE ts98 ) ;
 ,   1998 ,     CALLS,     CALLS9801.        (,   -      )       ,      .
:
,    Year 2000, , ,     .    .
  ,   ,     . ,       ,    Oracle,     -,      21- . ,   ,         TO_DATE   ,      RR      NLS_DATE_FORMAT.
52	Oracle S