For example, where the element is 'hi', and where N is 3, I need a PostgreSQL snippet I can use in a SELECT query that returns the following array:
['hi', 'hi', 'hi']
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3 Answers
Postgres provides array_fill for this purpose, e.g.:
SELECT array_fill('hi'::text, '{3}');
SELECT array_fill('hi'::text, array[3]);
The two examples are equivalent but the 2nd form is more convenient if you wish to replace the dimension 3 with a variable.
See also: https://www.postgresql.org/docs/current/functions-array.html
Comments
You may use array_agg with generate_series
select array_agg(s) from ( values('hi')) as t(s) cross join generate_series(1,3)
Generic
select array_agg(s) from ( values(:elem)) as t(s) cross join generate_series(1,:n)
1 Comment
Tavin
You can simplify it a little:
SELECT array_agg('hi'::text) FROM generate_series(1, 3)with cte as (
select 'hi' as rep_word, generate_series(1, 3) as value
) -- ^^^ n = 3
select array(SELECT rep_word::text from cte);
answered May 24, 2019 at 4:17
Juan Carlos Oropeza
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