Export from Postgres as fixed width file

In order for my client's ERP system (xTuple) to work with their new banking system, the check registry needs to be exported as a fixed with file.  The fields sizes are preset and will have leading zeros (e.g., 000101, 00000243).

What is the best way to get the results of a query to look like this.
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earth man2Commented:
Select to_char(101,'000000'),to_char(243,'00000000');

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zicemanAuthor Commented:
Excellent.  So would the SQL look something like this?

SELECT to_char(check_num, '000000') as checknumber,
              to_char(acct_num,'000000000') as accoutnumber,
              to_char(rout_num,'00000000000') as routing number
FROM check_reg
earth man2Commented:
Yes though take care how you alias the column names spelling and blanks ....
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