DO $do$
DECLARE cmonth TEXT;
DECLARE dmonth TEXT;

BEGIN
FOR i IN 1..15 LOOP

cmonth = CONCAT('"credMonth' , i::text, '"');
dmonth = CONCAT('"debMonth' , i::text, '"');

EXECUTE
format('SELECT
    "mainObj", "FY", "setOfBooks", $1, $2, $3 AS "fiscalMonth"
FROM
    "wde_transaction_figures"
WHERE
    "dataType" = ''(80)'' AND
    ($1 != ''0.00'' OR $2 != ''0.00'')')
USING cmonth, dmonth, i;

END LOOP;
END
$do$ LANGUAGE plpgsql;