pipelinedb aggregates in where clause -


im using pipelinedb testing analysis of data streams sensors. want able, example, find events in stream defined aggregate. e.g. find events difference between max(temperature) , min(temparature) in last 5 minutes exceeds range.

when trying put aggregates in clause error message saying 'aggregates not allowed in continuous views clasues'

am missing here or not possible?

otherwise pipelinedb very much!

well, pipelinedb says: "continuous queries don't support having clauses".

what i'm trying following:

i have stream named geo_vital_stream, sends sensor data along geolocation. @ moment interested

insert geo_vital_stream (device_id, user_id, measured_at, heartrate, energy, eda, lon, lat)  values( 'a005d8-e4 2.0',1,'2015-10-08 15:04:33.134000+02',96.8497201823,351.056269367,0.505791,8.07154018407,52.9531484103 );

my cv looks this:

create continuous view cv_sensor_eda  select user_id::integer,         max(eda::numeric) -  min(eda::numeric) range_eda  geo_vital_stream (measured_at > clock_timestamp() - interval '1 minutes') group user_id

now, interested in "events", range (range_eda execeeds value in last minute.)

using aggregate in where clause isn't legal sql. accomplished using having clause, doesn't seem that's need here. since aggregates compute values across multiple rows, it's not clear me how you'd retrieve individual events based on aggregates (min, max) across multiple events. provide example of each event looks like?


Comments

Post a Comment

Popular posts from this blog

html - Outlook 2010 Anchor (url/address/link) -

i'm trying link specific pdf page msoutlook'10 or msword'10, #page=... anchor particularly useful , works fine elsewhere. unfortunately when click [ctr-k] in outlook or winword, links re-formatted assuming unc path. pdf file located on shared drive. using "file:" prefix links open pdf in adobe reader (outside of browser), , "http:" open inside browser. issue seem need open in browser "file:" prefix in order anchor work. know anchors work inside browser. outlook uses windows/explorer default program (based on file extension) seems open in adobe reader neglecting anchor. is aware of solution, link specific page or bookmark of shared-pdf ms outlook and/or winword link? common references: mailermailer.com/...anchor-tags-html-emails campaignmonitor.com/...anchor-links-in-email-newsletters/ stackoverflow.com/...anchor-in-pdf-document
Read more

javascript - Why does running this loop 9 times take 100x longer than running it 8 times? -

consider code: test = function() { } t = new test(); (var = 0; < 8; i++) { result = t instanceof test; } if change number of iterations 8 9 , loop take 100 times longer complete in latest version of firefox (41.0.1). tested on 2 different pcs , magic limit 8. here jsperf test used: http://jsperf.com/instanceof-8-times-vs-9-times does have idea why might happen? seems specific instanceof . not happen if else object, example check property. note: filed bugzilla bug this. jan de mooij mozilla team has posted details in bugzilla thread . here's simplistic interpretation of highly technical answers: in i < 8 case, firefox smart enough hoist result = t instanceof test; statement out of loop (according tests, doesn't seem omit altogether). in i < 9 case, apparently doesn't optimization . why? reason not clear, related fact 9 iterations threshold above function considered "hot" enough run through jit compiler. i < 8 cas...
Read more

Getting gateway time-out Rails app with Nginx + Puma running on Digital Ocean -

following this guide setup app on digital ocean droplet, not working. site not loading , it's throwing: "gateway time-out". the puma server works, since ps aux | grep puma prints: root 15878 0.0 0.4 376832 2168 ? sl 12:50 0:00 puma 2.13.4 (unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock) [20150930164940] root 15881 0.0 0.7 903676 3692 ? sl 12:50 0:06 puma: cluster worker 0: 15878 [20150930164940] root 24654 0.0 0.1 11748 916 pts/2 s+ 18:00 0:00 grep --color=auto puma my nginx config: user root; worker_processes 1; events { worker_connections 1024; } http { upstream puma { server unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock; } server { listen 80; server_name myapp.com; root /var/www/myapp/current/public; access_log /var/www/myapp/current/log/access.log; error_log /...
Read more