Difference between Storage Grain and Query Grain

What is the difference between Storage Grain and Query Grain ?
In the query below:
Select quarter, YearAgoSales:
Query grain: quarter
Time Series grain : year
what is the Storage Grain ?
As mentioned in Help Guide, Storage Grain is "grain of the aggregate source".
Regards,

storage grain: by its name is the grain of your source.
query grain: by its name is the grain at which you define your query.
based on the example you mentioned:
Though you have a source at day grain, you are querying at quarter level (which corresponds to query grain)....
mark posts promptly
-bifacts
http://www.obinotes.com

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================
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     , nvl (items - lag (items) over (order by dt), 0)like in
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2 (
3 select 'AAA' name, to_date('01-SEP-09', 'dd-MON-rr') dt, 100 items from dual union all
4 select 'BBB' name, to_date('02-SEP-09', 'dd-MON-rr') dt, 101 items from dual union all
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8 )
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11       , items
12       , nvl (items - lag (items) over (order by dt), 0)
13    from test
14 ;
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AAA 01-SEP-09        100                                      0
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CCC 03-SEP-09        200                                     99
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EEE 05-SEP-09        400                                    200
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