Oracle SQL to group every 2 hours

I would like to make an SQL script to group shipments every two hours. I want to know how many Tons where shipped every 2 hours.
This script gives the shipped every hour:
  select to_char(weight_out_date,'DD-MM-YYYY HH24') Hours, sum(actual_qty) Shipped from shipments
  where to_char(weight_out_date,'YYMMDDHH24') between '07032408' and '07032507'
 and item_number between 7350 and 7356
  group by to_char(weight_out_date,'DD-MM-YYYY HH24')
LVL 14
Ehab SalemIT ManagerAsked:
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GGuzdziolCommented:
group by to_char(weight_out_date,'DD-MM-YYYY HH24')

should become

group by to_char(weight_out_date,'DD-MM-YYYY'), trunc(to_number(to_char(weight_out_date, 'HH24')) / 2)

Apply this for select clause also and voila.
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ishandoCommented:
I don't think a simple divide by 2 will be enough... you also need to drop fractional parts. Try

group by to_char(weight_out_date,'DD-MM-YYYY'), floor(to_char(weight_out_date,'HH24')/2)
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GGuzdziolCommented:
ishando:

trunc(to_number(to_char(weight_out_date, 'HH24')) / 2) -> trunc gets rid of fractional
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ishandoCommented:
oops, sorry you are right - I should read a bit more carefully!!
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Ehab SalemIT ManagerAuthor Commented:
Thanks.

I just added a small modification as I want to display 0-2-4-6... and not 0-1-2-3
 group by trunc(to_number(to_char(weight_out_date, 'HH24')) / 2)*2
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