RE: How to retrieve the partition info for each partition table?

[Igor Neyman <ineyman@xxxxxxxxxxxxxx>]

 

From: Yuxia Qiu [mailto:yuxiaqiu1@xxxxxxxxx]
Sent: Wednesday, October 24, 2018 1:29 PM
To: pgsql-general@xxxxxxxxxxxxxxxxxxxx
Subject: How to retrieve the partition info for each partition table?

 

HI,

 

   I have created some partition table, as example bellow:

CREATE TABLE public.measurement

(

    city_id integer NOT NULL,

    logdate date NOT NULL,

    peaktemp integer,

    unitsales integer

) PARTITION BY RANGE (logdate) ;

 

CREATE TABLE public.measurement_y2006m02 PARTITION OF public.measurement

    FOR VALUES FROM ('2006-02-01') TO ('2006-03-01');

 

CREATE TABLE public.measurement_y2006m03 PARTITION OF public.measurement

    FOR VALUES FROM ('2006-03-01') TO ('2006-04-01');

 

I know how to get a list partition tables for above example by calling : 

SELECT i.inhrelid::regclass AS child

FROM   pg_inherits i

WHERE  i.inhparent = 'public.measurement'::regclass;

 

My question is: how to get the value boundary for each partition table like bellow?

measurement_y2006m02       FROM ('2006-02-01') TO ('2006-03-01')

measurement_y2006m03       FROM ('2006-03-01') TO ('2006-04-01')

 

Thanks,

Yuxia

 

Better yet:

 

SELECT relname, pg_get_expr(relpartbound, oid) FROM pg_class WHERE relpartbound IS NOT NULL;

 

Regards,

Igor Neyman