PostgreSQL string character replacement

Question

I\'m trying to write a lexical database for storing words comprised of roots and patterns, and I was wondering how I could create a column that will combine the root and pattern

Answer 1

select
  root,
  root_i,
  translate(root_i, "123", array_to_string(root,'')) as word_i
NATURAL JOIN tbl_patterns
NATURAL JOIN tbl_patterns_triliteral
where root is not null and root_i is not null;