Postgres Queries

partition_by_year_month.sql

-- create a table ready for partitions

CREATE TABLE IF NOT EXISTS public.mytable (
	dob date NULL
--other columns...
) PARTITION BY RANGE (dob)
WITH (
    OIDS = FALSE
);

-- create a yearly and monthly sequence of partitions
DO $$
BEGIN
  FOR i IN 2019..2023
  loop
	  FOR j IN 1..11
	  LOOP
	    EXECUTE format('create table %I partition of public.mytable for values FROM (''%s-%s-01'') to (''%s-%s-01'')', 'public.mytable_y' || i || '_m' || to_char(j, 'FM00'), i, to_char(j, 'FM00'), i, to_char(j+1, 'FM00'));
	  END loop;	    
	  
	  EXECUTE format('create table %I partition of public.mytable for values FROM (''%s-12-01'') to (''%s-01-01'')', 'public.mytable_y' || i || '_m12', i, i+1);

  END LOOP;
END;
$$;