(select 'beginning'::varchar as t_date, sum(movementqty) as qty
from m_transaction
where m_product_id='0015779EEE8D4EA8A0E54228C4408B23'
and movementdate<'2017-04-01')

union all

(select movementdate::date::varchar as t_date, sum(movementqty) as qty
from m_transaction
where m_product_id='0015779EEE8D4EA8A0E54228C4408B23'
and movementdate>='2017-04-01'
and movementdate<='2017-05-01'
group by movementdate
order by movementdate)

union all

(select 'saldo'::varchar as t_date, sum(movementqty) as qty
from m_transaction
where m_product_id='0015779EEE8D4EA8A0E54228C4408B23'
and movementdate<='2017-05-01')