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create function r(str text) returns text as $$ begin return reverse(str); end; $$ language plpgsql; select * from r('Hello world!'); create function fact(n integer) returns integer as $$ declare result integer := 1; begin for i in 2..n loop result := result * i; end loop; return result; end; $$ language plpgsql; select * from r('Hello world!'); select fact(10); create function add_to_date(integer, date) returns date as 'select $2 + $1 days;' language sql; select add_to_date(1, current_date);

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