Oracle 11g 虚拟列子分区实验
以下两个create 语句均为创建成功；
需求描述：
项目要求对3个字段进行分区，如时间，小时，还有个区域ID，便联想到虚拟列。
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drop table test_part purge;
create table test_part
(t_time date,
hour number,
city_id number,
hour_city varchar2(108) GENERATED ALWAYS AS(to_char(hour)||'|'||to_char(city_id)))
partition by range(t_time) subpartition byhash(hour_city)
(partition part_201705 values less than(to_date('20170601', 'yyyymmdd'))
(subpartition subpart_201705_01,
subpartition subpart_201705_02),
partition part_201706 values less than (to_date('20170701', 'yyyymmdd'))
(subpartition subpart_201706_01,
subpartition subpart_201706_02))
create table test_part
(t_time date,
hour number(2),
city_id number,
day_hour varchar2(50) GENERATED ALWAYS AS (to_char(t_time,'yyyymmdd')||'|'||to_char(hour)))
partition by range(day_hour) subpartition byhash(city_id)
(partition part_201705 values less than('2017060100')
(subpartition subpart_201705_01,
subpartition subpart_201705_02),
partition part_201706 values less than ('2017070100')
(subpartition subpart_201706_01,
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