ORACLE HOW TO APPLY CTAS WITH SUBPARTITION? - sql

Question

I am trying to build subpartitioned table with CTAS from non-partitioned table but I got errors. How can I do that.Here is similiar example for my data ID IS PRIMARY KEY:
TASK
ID START_DATE
1 22/09/21
2 21/09/21
3 20/09/21
And Here is my code :
CREATE TABLE EMPLOYEE AS
(SELECT * FROM TASK)
PARTITION BY RANGE ("START_DATE")
SUBPARTITION BY LIST("ID")
PARTITION P1 VALUES LESS THAN TO_DATE('20210920','YYYYYMMDD') (
SUBPARTITION S1 VALUES (1),
SUBPARTITION S2 VALUES (2),
SUBPARTITION S3 VALUES (3)
),
PARTITION P2 VALUES LESS THAN TO_DATE('20210921','YYYYYMMDD') (
SUBPARTITION S4 VALUES (1),
SUBPARTITION S5 VALUES (2),
SUBPARTITION S6 VALUES (3)
),
PARTITION P3 VALUES LESS THAN TO_DATE('20210922','YYYYYMMDD') (
SUBPARTITION S7 VALUES (1),
SUBPARTITION S8 VALUES (2),
SUBPARTITION S9 VALUES (3)
),
PARTITION P4 VALUES LESS THAN MAXVALUE (
SUBPARTITION S10 VALUES (1),
SUBPARTITION S11 VALUES (2),
SUBPARTITION S12 VALUES (3)
)
How can I do that it is important for me I am getting this error and I think I will get another errors when I correct it:
00933. 00000 - "SQL command not properly ended"

Answer 1

An example
SQL> create table task ( id number , start_date date ) ;
Table created.
SQL> CREATE TABLE t2
2 PARTITION BY RANGE (START_DATE)
3 SUBPARTITION BY LIST (ID)
4 (
5 PARTITION P1 VALUES LESS THAN (TO_DATE('2021-07-20','YYYY-MM-DD'))
6 (
7 SUBPARTITION S1 VALUES (1),
8 SUBPARTITION S2 VALUES (2),
9 SUBPARTITION S3 VALUES (3)
10 ),
11 PARTITION P2 VALUES LESS THAN (TO_DATE('2021-08-20','YYYY-MM-DD'))
12 (
13 SUBPARTITION S4 VALUES (1),
14 SUBPARTITION S5 VALUES (2),
15 SUBPARTITION S6 VALUES (3)
16 )
17 )
18* as select * from task
SQL> /
Table created.
Considerations
Use the expression as select * from xxx at the end of the construction.
Keep in mind the parenthesis for each partition and subpartition construction.
Although I did not put it on my example, try to use a subpartition template.

Answer 2

I would recommend an INTERVAL partition and subpartition template. Would be this one:
CREATE TABLE EMPLOYEE (
...
)
PARTITION BY RANGE (START_DATE) INTERVAL (INTERVAL '1' DAY)
SUBPARTITION BY LIST (ID)
SUBPARTITION TEMPLATE (
SUBPARTITION S1 VALUES (1),
SUBPARTITION S2 VALUES (2),
SUBPARTITION S3 VALUES (3)
)
( PARTITION P_INITIAL VALUES LESS THAN (TIMESTAMP '2021-09-01 00:00:00') SEGMENT CREATION DEFERRED );