Record Type Arrays

Another question that I was asked today: “Can you create an array of a record type in PL/pgSQL?” The answer is yes.

You first have to create a type, which is what you do when you want to create a table with an embedded table. This is a simple full_name record type:

CREATE TYPE full_name AS
( first_name   VARCHAR(20)
, middle_name  VARCHAR(20)
, last_name    VARCHAR(20));

The following DO block shows you how to create a record type array and then print it’s contents in a FOR-LOOP:

DO
$$
DECLARE
  -- An array of full_name records.
  list  full_name[] = 
          array[('Harry','James','Potter')
               ,('Ginevra','Molly','Potter')
               ,('James','Sirius','Potter')
               ,('Albus','Severus','Potter')
               ,('Lily','Luna','Potter')];
BEGIN
  -- Loop through the integers.
  FOR i IN 1..CARDINALITY(list) LOOP
    RAISE NOTICE '%, % %', list[i].last_name, list[i].first_name, list[i].middle_name;
  END LOOP;
END;
$$;

Since you typically only have a single dimension array with record-type structure, using CARDINALITY is clearer than ARRAY_LENGTH(list,1). If you don’t agree use the latter.

It prints the following:

NOTICE:  Potter, Harry James
NOTICE:  Potter, Ginevra Molly
NOTICE:  Potter, James Sirius
NOTICE:  Potter, Albus Severus
NOTICE:  Potter, Lily Luna
DO

As always, I hope this helps those looking for a solution to this type of problem.