Hent data for 31. december af de sidste 5 år og dagens dato

Forudsat at dine datoer altid har en tidskomponent ved midnat, så:

SELECT *
FROM   your_table
WHERE  your_date_column IN (
         TRUNC( SYSDATE ),
         TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY,
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -24 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -36 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -48 )
       );

(Du skal tilføje 1 dag før afkortning for at matche sagen, når i dag er den 31. december)

Den enkle løsning ville være at bruge TRUNC på datoen.

SELECT *
FROM   your_table
WHERE  TRUNC( your_date_column ) IN (
         TRUNC( SYSDATE ),
         TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY,
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -24 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -36 ),
         ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -48 )
       );

Men så kan du ikke bruge et indeks på kolonnen og ville have brug for et funktionsbaseret indeks på TRUNC( your_date_column ) for at kunne bruge et indeks.

Den mere komplicerede løsning, der kan bruge indekser, er:

SELECT *
FROM   your_table
WHERE  ( your_date_column >= TRUNC( sysdate )
     AND your_date_column  < TRUNC( sysdate ) + INTERVAL '1' DAY
       )
OR     ( your_date_column >= TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY
     AND your_date_column  < TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' )
       )
OR     ( your_date_column >= ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 )
     AND your_date_column  < ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ), -12 )
       )
OR     ( your_date_column >= ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 )
     AND your_date_column  < ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ), -24 )
       )
OR     ( your_date_column >= ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 )
     AND your_date_column  < ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ), -36 )
       )
OR     ( your_date_column >= ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ) - INTERVAL '1' DAY, -12 )
     AND your_date_column  < ADD_MONTHS( TRUNC( SYSDATE + INTERVAL '1' DAY, 'YYYY' ), -48 )
       );