SQL Server: query to get the data between two values from same columns and calculate time difference -


i have requirement number of hours between 2 values, 20 , 25 or above (this user input values , not fixed). below table sample data.

consider in table on 01-09-2016 08:40 value_id 25 , reaches 20 on 02-09-2016 13:20, need consider number of hours between these 2 range ie 12 hours , 40 min .. 04-09-2016 13:20 reached 26.3 (which above 25 ) , '06-09-2016 16:20' reached 19.3 (below 20) , number of hours 45 hours. tried creating function, it's not working..

code create table:

create table [dbo].[numofhrs]( [id] [float] null, [date] [datetime] null, [value_id] [float] null ) on [primary]

code insert data : 

insert [dbo].[numofhrs]        ([id]        ,[date]        ,[value_id])  values (112233,'8-31-2016 08:20:00',19.2), (112233,'9-01-2016 08:30:00',24), (112233,'9-01-2016 08:40:00',25), (112233,'9-01-2016 09:20:00',26), (112233,'9-02-2016 10:20:00',27), (112233,'9-02-2016 10:20:00',24), (112233,'9-02-2016 10:20:00',23), (112233,'9-02-2016 11:20:00',22), (112233,'9-02-2016 12:20:00',21), (112233,'9-02-2016 13:20:00',20), (112233,'9-03-2016 13:20:00',19.8), (112233,'9-04-2016 13:20:00',21), (112233,'9-04-2016 14:20:00',24), (112233,'9-04-2016 16:20:00',24.6), (112233,'9-04-2016 19:20:00',26.3), (112233,'9-04-2016 23:20:00',27), (112233,'9-05-2016 00:20:00',22), (112233,'9-06-2016 16:20:00',19.3), (112233,'9-07-2016 00:20:00',22), (112233,'9-08-2016 00:20:00',21), (112233,'9-09-2016 00:20:00',23), (445566,'9-10-2016 00:20:00',24), (445566,'9-11-2016 00:20:00',25), (445566,'9-12-2016 00:20:00',26), (445566,'9-13-2016 00:20:00',24), (445566,'9-14-2016 00:20:00',23), (445566,'9-15-2016 00:20:00',24), (445566,'9-16-2016 00:20:00',21), (445566,'9-17-2016 00:20:00',20), (445566,'9-18-2016 00:20:00',18.5), (445566,'9-19-2016 00:20:00',17)

image of table: enter image description here

well, couldn't think of simpler. here's try solve problem:

;with numofhrs_rn (     select id, [date], value_id,             row_number() on (partition id order [date]) rn     [dbo].[numofhrs]  ), numofhrs_lag (     select t1.id, t1.[date],             t2.value_id prev_value,             t1.value_id curr_value                numofhrs_rn t1     -- previous value (lag)     join numofhrs_rn t2 on t1.id = t2.id , t1.rn = t2.rn + 1  ), numofhrs_flag (     select id, [date], prev_value, curr_value,             case                when curr_value >= 25 , prev_value < 25 'start'               when curr_value <= 20 , prev_value > 20 'stop'               else 'ignore'            end flag     numofhrs_lag ), numofhrs_grp (      select id, [date], curr_value, flag,            row_number() on (partition id order [date]) -            case flag               when 'start' 0               when 'stop' 1            end grp     numofhrs_flag     flag in ('start', 'stop') ) select min([date]) 'start', max([date]) 'stop' numofhrs_grp group id, grp order min([date])

output:

start                    stop ------------------------------------------------ 2016-09-01 08:40:00.000  2016-09-02 13:20:00.000 2016-09-04 19:20:00.000  2016-09-06 16:20:00.000 2016-09-11 00:20:00.000  2016-09-17 00:20:00.000

you can manipulate above query in order time difference expressed in hours/minutes/seconds format.

demo here


Comments

Post a Comment

Popular posts from this blog

node.js - Node js - Trying to send POST request, but it is not loading javascript content -

i have been trying send post request website, , has not been loading full site. i guessing problem node js not loading javascript content, executing it. can see javascript in response, though never loads content javascript files producing in html. what mean is, doesn't execute javascript. how make node js code overcome this, , wait the full website load? have tried native code, , "request' module, both producing same errors. if helps, don't need native javascript. modules fine. some code have tried (request module): var options = { method: 'post', uri: 'https://url', formdata: { 'email': 'email', 'prize': '0', 'transactional': 'on' }, headers: { /* 'content-type': 'application/x-www-form-urlencoded' */ // set automatically } }; rp(options) .then(function (body) { console.log(body) }) .catch(function (err) { console.log(err) }); when fetch content...
Read more

javascript - Replicate keyboard event with html button -

i have tried few ways make happen. have javascript pinball game uses keyboard keys controls. converting application touch screen display. workaround, hoping overlay buttons when clicked simulate keyboard strokes. have done research , sounds should work. using jquery v3.2.1 here things have tried far... html element: <input type="button" class="coil"></input> $('.coil').trigger({type: 'keydown', which: 40, keycode: 40}); with this, not errors, nothing happens. var coilkey = $('body').keydown(function(e) { switch (e.keycode) { case 40: break;} }) $('.coil').click(coilkey); this 1 returns error in console... ((jquery.event.special[handleobj.origtype] || (intermediate value)).handle || handleobj.handler).apply not function below javascript game engine handles key listeners... addkeylistener: function (keyandlistener) { this.keylisteners.push(keyandlistener); }, // gi...
Read more

javascript - Web audio api 5.1 surround example not working in firefox -

i've been playing lott lately web audio api on both firefox , chrome. few days ago started experiment surround set. when trying surround audio in web audio api came notice example works fine in chrome v59 not in firefox v54. // create web audio api context var audioctx = new (window.audiocontext || window.webkitaudiocontext)(); audioctx.destination.channelinterpretation = 'discrete'; audioctx.destination.channelcountmode = 'explicit'; audioctx.destination.channelcount = 6; var oscillators = []; var merger = audioctx.createchannelmerger(6); console.log(audioctx.destination, merger); //merger.channelinterpretation = 'discrete'; //merger.channelcountmode = 'explicit'; //merger.channelcount = 6; var addoscilator = function(channel, frequency) { var oscillator = audioctx.createoscillator(); oscillator.frequency.value = frequency; // value in hertz oscillator.connect(merger,0,channel); oscillator.start(); oscillators.push(o...
Read more