postgresql make each element in array distinct

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1SELECT ARRAY(SELECT DISTINCT unnest(t_column)) FROM t_name;

1SELECT ARRAY(SELECT DISTINCT e FROM unnest(ARRAY[a,b,c,d]) AS a(e))
2FROM ( VALUES
3  ('foo', 'bar', 'foo', 'baz' )
4) AS t(a,b,c,d);

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