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GROUP_CONCAT(DISTINCT t2.T_CODES ORDER BY t2.T_CODES ASC) AS t_str, PostgreSQL 8.4
array_to_string(array_agg(t2.T_CODES), , ) AS t_str,
PostgreSQL 9
string_agg(t2.T_CODES), , ) MySQL
GROUP_CONCAT(DISTINCT t2.T_CODES ORDER BY t2.T_CODES ASC) AS t_str, PostgreSQL 8.4
array_to_string(array_agg(t2.T_CODES), , ) AS t_str,
PostgreSQL 9
string_agg(t2.T_CODES), , )
