Range partiotion using interval partitioning

Question

Hi all,
I am trying to create a partitioned table so that a number (which date converted to number ) partition is created on inserting a new row for release_date column.
But please note that release_date column is having number data type (as per design) and people want to create an interval based partition on this.
Any work around for this?
They want data type NOT to be altered.
create table product(
prod_id number,
prod_code varchar2(3),
release_date number)
partition by range(release_date)
interval(NUMTOYMINTERVAL (1,'MONTH'))
(partition p0 values less than (20120101))
Thanks in advance

Answer 1

>
I am trying to create a partitioned table so that a number (which date converted to number ) partition is created on inserting a new row for release_date column.
But please note that release_date column is having number data type (as per design) and people want to create an interval based partition on this.
>
You can't use interval partitioning on the NUMBER column but you can add a VIRTUAL column based on it that uses DATE datatype.
create table product(
prod_id number,
prod_code varchar2(3),
release_date number,
rel_date DATE as (to_date(to_char(release_date), 'yyyymmdd')) VIRTUAL
partition by range(rel_date)
interval(NUMTOYMINTERVAL (1,'MONTH'))
   partition p0 values less than (to_date('20120101', 'yyyymmdd'))
)The virtual column is a metadata only column (i.e. no data is stored for it).
NOTE: you will need to modify your queries to use the 'REL_DATE' column in order to get partition pruning:
insert into product (prod_id, prod_code, release_date) values (1,'abc', 20110502)
insert into product (prod_id, prod_code, release_date) values (1,'abc', 20120502)
-- this query does NOT prune
select * from product where release_date < 20120101
|   0 | SELECT STATEMENT    |         |     1 |    38 |     4   (0)| 00:00:01 |       |       |
|   1 |  PARTITION RANGE ALL|         |     1 |    38 |     4   (0)| 00:00:01 |    1 |1048575|
|*  2 |   TABLE ACCESS FULL | PRODUCT |     1 |    38 |     4   (0)| 00:00:01 |    1 |1048575|
-- this query DOES prune
select * from product where rel_date < to_date('20120101', 'yyyymmdd')
|   0 | SELECT STATEMENT       |         |     1 |    38 |     3   (0)| 00:00:01 |       |       |
|   1 |  PARTITION RANGE SINGLE|         |     1 |    38 |     3   (0)| 00:00:01 |     1 |     1 |
|*  2 |   TABLE ACCESS FULL    | PRODUCT |     1 |    38 |     3   (0)| 00:00:01 |     1 |     1 |