Cross PDO driver compatible GROUP_CONCAT?

Is th开发者_运维技巧ere an efficient alternative to GROUP_CONCAT that works in the major PDO drivers?

Given this MySQL:

select group_concat(c separator ',') from t

you could do this in PostgreSQL:

select array_to_string(array_agg(c), ',') from t

or this in SQLite:

select group_concat(c, ',') from t

I don't know about SQL Server though.

References:

• MySQL group_concat
• PostgreSQL array_agg
• PostgreSQL array_to_string
• SQLite group_concat