Partition by Range(c1,c2) and have c1 to be MAXVALUE for a specific c2

Question

I have a table where two of the columns are used for PARTITION BY RANGE(C1,C2). Is it possible to have a partition scheme where for a specific c2, c1 can be MAXVALUE? The number of records of for a specific C2 are very few and I would like to have just one partition for all C1 values.

Answer 1

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I have a table where two of the columns are used for PARTITION BY RANGE(C1,C2). Is it possible to have a partition scheme where for a specific c2, c1 can be MAXVALUE? The number of records of for a specific C2 are very few and I would like to have just one partition for all C1 values.
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If you want one partition for all C1 values for a particular C2 then you need to reverse the order of the partition keys and use PARTITION BY RANGE(C2, C1).
drop table myTable cascade constraints;
CREATE TABLE myTable (c1 number, c2 number, description varchar2(30))
PARTITION BY RANGE (C2, C1)
  (PARTITION p_before3_5 VALUES LESS THAN (3, 5),
   PARTITION p3_5_to_4_5  VALUES LESS THAN (4,5),
   PARTITION p4_5_to_5  VALUES LESS THAN (5,maxvalue),
   PARTITION p_special_6  VALUES LESS THAN (7,0),
   PARTITION future     VALUES LESS THAN (MAXVALUE,0));
insert into myTable (c2, c1) values (5, 3);
insert into myTable (c2, c1) values (6, 3);
insert into myTable (c2, c1) values (6, 8);
insert into myTable (c2, c1) values (7, 3);
select * from mytable partition (p_special_6);
C1,C2,DESCRIPTION
3,6,
8,6,The 'p_special_6' partition captures everything for C2 = 6 assuming that the min value of c1 is 0. Note that the previous partition has to be defined as '(5, maxvalue)' to capture everything less than C2 = 6.
See Example 4-21 Creating a multicolumn range-partitioned table in the doc link already provided for other examples.