How to remove duplicated values in an array and maintain the order?
select array_agg(unnest) filter (where row_number = 1) from (select unnest, ordinality, row_number() over(partition by unnest order by ordinality) from (select * from unnest('{7,7,5,6,2,2,3,8,5,4,5}'::integer[]) with ordinality) x order by ordinality) x
