sql - MySQL MAX from SUM -

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this freaking me out! got following data:

+----+-----+-------+------------+ | id | reg | value | date       | +----+-----+-------+------------+ | 1  | 1a  | 100   | 2009-01-01 | | 1  | 1a  | 100   | 2009-02-01 | | 1  | 1a  | 100   | 2009-03-01 | | 2  | 1b  | 100   | 2009-01-01 | | 2  | 1b  | 100   | 2009-02-01 | | 2  | 1b  | 100   | 2009-03-01 | | 2  | 1c  | 100   | 2009-01-01 | | 2  | 1c  | 100   | 2009-02-01 | | 2  | 1c  | 200   | 2009-03-01 | +----+-----+-------+------------+

ps {edit 0001} :: there's field, must used filter data, call {type}, 'single' or 'multiple' value.

i want max between sum(of each different {reg}) every {id}. obviously, simple representation, table got 64985928 registers , {date} filtering data.

that be, 1st step sum each {reg}:

+----+------+ | id | sum  | +----+------+ | 1  | 300  | | 2  | 300  | | 2  | 400  | +----+------+

that's: 

select    sum(value)     table    (date between '2009-01-01' , '2009-03-01') group   reg;

and then, max each sum, i'm stucked:

+----+------+ | id | max  | +----+------+ | 1  | 300  | | 2  | 400  | +----+------+

i've tried:

select   a.id,   max(b.sum)   table a,   (select       sum(b.value)           table b           (b.date between '2009-01-01' , '2009-03-01') , (a.id = b.id)    group      b.reg);

any idea? ps: sorry mistakes.

ps {edit 0002} gonna copy original queries , data, may helps better.

$query: 

select    clienteid "cliente",   sum(saldo) "suma"    etl.creditos    (titularidad_tipo 'titular') ,    (mes_datos between '2008-11-01' , '2009-10-01') group   nuc  order   clienteid;

got:

+---------+-------------+ | cliente | suma        | +---------+-------------+ | 64      | 1380690.74  | | 187     | 1828468.71  | | 187     | 2828102.80  | | 325     | 26037422.21 | | 389     | 875519.05   | | 495     | 20084.93    | | 495     | 109850.46   | +---------+-------------+

then, i'm looking is:

+---------+-------------+ | cliente | max         | +---------+-------------+ | 64      | 1380690.74  | | 187     | 1828468.71  | | 325     | 26037422.21 | | 389     | 875519.05   | | 495     | 109850.46   | +---------+-------------+

but running: 

select     clienteid "cliente",     max(suma)     (select clienteid, sum(saldo) "suma" etl.creditos     (mes_datos between '2009-08-01' , '2009-10-01') , (titularidad_tipo 'titular')     group clienteid, nuc) sums group     clienteid order     clienteid;

results as:

+---------+-------------+ | cliente | suma        | +---------+-------------+ | 64      | 336879.21   | | 187     | 1232824.51  | | 325     | 3816173.62  | | 389     | 218423.83   | | 495     | 34105.99    | +---------+-------------+ 

select id, max(reg_sum) (    select id, sum(value) reg_sum table      (date between '2009-01-01' , '2009-03-01')    group  id, reg ) group id

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