【多选题】
A <{p}>SELECT TO_CHAR('2019-DEC-25 15:30', 'YYYY-MON-DD HH24:MI', 'NLS_DATE_LANGUAGE =
AMERICAN' )
FROM DUAL;<{/p}>
B <{p}>SELECT TO_DATE (TO_CHAR('2019-DEC-25 03:30', 'YYYY-MON-DD HH12:MI'))
FROM DUAL;<{/p}>
C <{p}>SELECT TO_CHAR('2019-DEC-25 15:30', 'YYYY-MON-DD HH24:MI')
FROM DUAL;<{/p}>
D <{p}>SELECT TO_DATE('2019-DEC-25 15:30', 'YYYY-MON-DD HH24:MI', 'NLS_DATE_LANGUAGE =
AMERICAN')
FROM DUAL;<{/p}>
E <{p}>SELECT TO_CHAR(TO_DATE('2019-DEC-25 03:30', 'YYYY-MON-DD HH12:MI'))
FROM DUAL;<{/p}>
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