How to generate a compounded view of data over time in Oracle SQL -


say have base number 10 , table has value of 20 associated november 2013, , value of 10 associated march 2014. want populate list of months, , compounded value. may-november 2013, value should 10, between nov , mar, value should 10+20 , afterwards should 10+20+10.

so in table have following

month     value nov-2013  20 mar-2014  10

i'd have select statement somehow returns. there's initial value of 10, hard-coded base.

month     value may-2013  10 jun-2013  10 jul-2013  10 aug-2013  10 sep-2013  10 oct-2013  10 nov-2013  30 dec-2013  30 jan-2014  30 feb-2014  30 mar-2014  40

is doable?

in case understand requirements correctly,

sql fiddle

oracle 11g r2 schema setup:

create table months     ("mon" date, "value" int) ;  insert      months ("mon", "value")          values (date '2013-11-01', 20)     months ("mon", "value")          values (date '2014-03-01', 10) select * dual ;

query 1:

with months_interval ( select date '2013-05-01' interval_start,         max(mon) interval_end   months ) , all_months (   select add_months(m.interval_start,level-1) mon     months_interval m   connect level <= months_between(interval_end, interval_start) + 1 ), data_to_sum ( select am.mon,         decode(am.mon, first_value(am.mon) over(order am.mon), 10, m.value) value   months m, all_months    am.mon = m.mon(+) )   select mon, value, sum(value) over(order mon) cumulative   data_to_sum  order 1

results:

|                              mon |  value | cumulative | ---------------------------------------------------------- |       may, 01 2013 00:00:00+0000 |     10 |         10 | |      june, 01 2013 00:00:00+0000 | (null) |         10 | |      july, 01 2013 00:00:00+0000 | (null) |         10 | |    august, 01 2013 00:00:00+0000 | (null) |         10 | | september, 01 2013 00:00:00+0000 | (null) |         10 | |   october, 01 2013 00:00:00+0000 | (null) |         10 | |  november, 01 2013 00:00:00+0000 |     20 |         30 | |  december, 01 2013 00:00:00+0000 | (null) |         30 | |   january, 01 2014 00:00:00+0000 | (null) |         30 | |  february, 01 2014 00:00:00+0000 | (null) |         30 | |     march, 01 2014 00:00:00+0000 |     10 |         40 |

this 1 suboptimal performance-wise (queries months table twice etc.) , should optimized, idea - pregenerate list of months (i assumed interval start somehow fixed), left join data, use analytic sum function.


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

qt - Errors in generated MOC files for QT5 from cmake -

i generated moc files qt5 using set (cmake_automoc on) set(cmake_include_current_dir on) then add moc files src using set(src src/main.cpp src/video_widget_surface.cpp src/video_widget.cpp src/video_player.cpp #moc files moc/moc_video_player.cpp moc/moc_video_widget.cpp moc/moc_video_widget_surface.cpp finally add executable using add_executable(somegui ${src}) but errors in moc files saying : /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:54:6: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:62:19: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:20: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:46: error: non-member function 'const qmetaobject* metaobject()' cannot have cv-qualifier /other/qt5.0.1/5.0.1/gcc_64/include/qtcore/qo...
Read more