Обсуждение: Range partitioning and overlap

The table is partitioned into “ranges” defined by a key column or set of columns, with no overlap between the ranges of values assigned to different partitions. For example, one might partition by date ranges, or by ranges of identifiers for particular business objects."

CREATE TABLE measurement_y2006m02 PARTITION OF measurement
    FOR VALUES FROM ('2006-02-01') TO ('2006-03-01');

CREATE TABLE measurement_y2006m03 PARTITION OF measurement
    FOR VALUES FROM ('2006-03-01') TO ('2006-04-01');

...
CREATE TABLE measurement_y2007m11 PARTITION OF measurement
    FOR VALUES FROM ('2007-11-01') TO ('2007-12-01');

CREATE TABLE measurement_y2007m12 PARTITION OF measurement
    FOR VALUES FROM ('2007-12-01') TO ('2008-01-01')
    TABLESPACE fasttablespace;

De: David G. Johnston <david.g.johnston@gmail.com>
Enviado: sexta-feira, 13 de novembro de 2020 17:32
Para: Edson Richter <edsonrichter@hotmail.com>
Cc: pgsql-general <pgsql-general@postgresql.org>
Assunto: Re: Range partitioning and overlap

 

On Fri, Nov 13, 2020 at 1:29 PM Edson Richter <edsonrichter@hotmail.com> wrote:

"Range Partitioning

The table is partitioned into “ranges” defined by a key column or set of columns, with no overlap between the ranges of values assigned to different partitions. For example, one might partition by date ranges, or by ranges of identifiers for particular business objects."

Is there a misinterpretation from my side, or examples are inconsistent with the paragraph above?

Further on the documentation: "When creating a range partition, the lower bound specified with FROM is an inclusive bound, whereas the upper bound specified with TO is an exclusive bound."

David J.