sql - Grouping and summing items in a table using SSRS -

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i have ssrs report, , i'm trying sum rows conditionally. have:

11/15/2010 12:14:43 | current rate | current speed | amount used in minute (speed*rate/60) etc etc etc

i trying add rows happened in hour, report show:

11/15/2010 | 12 - 1 | amount used hour (say, 7 gallons)

i cannot find anywhere how conditionally sum row per hour, or how report above.

thank in advance!

using following table testing:

create table `log` (   `entry_date` datetime default null,   `amount_used` int(11) default null )

with test data:

entry_date           amount_used 2010-11-01 10:00:00, 3 2010-11-01 10:30:00, 1 2010-11-01 11:00:00, 6

use query date, hour range , total amount used:

select date(entry_date) entry_date,      concat_ws('-',convert(min(hour(entry_date)), char(2)), convert(max(hour(entry_date)),char(2))) hours,     sum(amount_used) amount_used (     select entry_date, sum(amount_used) amount_used      log     group date(entry_date), hour(entry_date)     ) t;

all concat/convert stuff range of hours in particular day, string. result:

entry_date  hours  amount_used 2010-11-01, 10-11, 10

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