如果要将5pm到5pm视为“同一”天，可以很容易地将Oracle日期向前或向后移动一天的时间（例如，可以将5pm向前移动7小时以成为“下一个”的开始）天）
SQL> create table ora_table (id number, time_data timestamp, status varchar2(30));Table created.SQL> insert into ora_table values (1 , to_timestamp('2019-10-20 12:34:56.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (1 , to_timestamp('2019-10-22 12:34:56.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (2 , to_timestamp('2019-10-20 17:34:56.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (2 , to_timestamp('2019-10-21 12:34:56.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (3 , to_timestamp('2019-10-23 18:10:10.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'mod_in_ip');1 row created.SQL> insert into ora_table values (3 , to_timestamp('2019-10-24 11:10:10.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (3 , to_timestamp('2019-10-24 12:10:10.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (4 , to_timestamp('2019-10-25 12:10:10.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL> insert into ora_table values (4 , to_timestamp('2019-10-25 18:10:10.000', 'yyyy-mm-dd hh24:mi:ss.ff'), 'approved');1 row created.SQL>SQL> select id, time_data, trunc(time_data) true_date, trunc(time_data+7/24) mapped_date 2 from ora_table; ID TIME_DATA TRUE_DATE MAPPED_DA---------- ---------------------------------- --------- --------- 1 20-OCT-19 12.34.56.000000 PM 20-OCT-19 20-OCT-19 1 22-OCT-19 12.34.56.000000 PM 22-OCT-19 22-OCT-19 2 20-OCT-19 05.34.56.000000 PM 20-OCT-19 21-OCT-19 <=== 2 21-OCT-19 12.34.56.000000 PM 21-OCT-19 21-OCT-19 3 23-OCT-19 06.10.10.000000 PM 23-OCT-19 24-OCT-19 <=== 3 24-OCT-19 11.10.10.000000 AM 24-OCT-19 24-OCT-19 3 24-OCT-19 12.10.10.000000 PM 24-OCT-19 24-OCT-19 4 25-OCT-19 12.10.10.000000 PM 25-OCT-19 25-OCT-19 4 25-OCT-19 06.10.10.000000 PM 25-OCT-19 26-OCT-199 rows selected.
