mysql - pulling values from two tables after Select distinct id on another table -


Sensors are spreading around my house, they send all data to an MSLL DB. Sensors send several samples of communication per second with DB which is every 5 minutes.

I have general sensor information (primary key sensor)

on the table 'sensor' I need to draw the most recent sample time and table 'sensor' from the table 'censored' On the most recent last connection from the table 'SensorMoritoring' for each specific sensor ID. So I can compare them to PHP.

Right now I am doing this with the whiles in PHP but I think an easy and more efficient way to do this with SQL is to Page 21 questions are done)

I have this: 

  Sensor ID selection from sensor   
 and then within a short time:  
  $ query1 = "Select IOS = Select Sensorizing by Selecting Selection". $ Line ["sensorID"] "order limit description description of the last contact"; $ Query2 = "Sensitendar where sensor id =" sample time from selection time ". $ Line ["sensorld"]. "Order of Samplit in Inability 1";   
  Is there a way to do this with a single SQL query ? (Possibly with Johns?)  Avoid long PHP code?   
 The end result will be something like this  
  Sensor Last Connection Sample Time ------------------- ------ --------------------------- 01 2014-04-20 09:38:56 2014-04-20 09 : 30: 00 02 2014 -04-20 09:35:05 2014-04-19 10:15:00 03 2014-04-20 09:33:27 2014-04-20 09:26:00 04-04- 04 09:45: Just one additional explanation of my project: In this case I could see that there are problems in sensor 02 because the most recent samples are older than 15 minutes but DB; The sensor 04 is communicating, but not collecting all the samples.  
 It is also said that: Sometimes sample time can be faucet.   
 
 
 You should be able to use all of these in a query:  
  SELECT s.SensorId, MAX (m.LastConnection) AS LastConnection, MAX (D. Sampling Time) S S sample time from sensor SEE and IIS (MS-ENERIAID) on SXOIR = M SENSER IDEIDE except join (SSCIRID = D. censid) Group Sscrd;

Comments

Post a Comment

Popular posts from this blog

Verilog Error: output or inout port "Q" must be connected to a structural net expression -

I get the error every time, I try to compile. I'm not sure why anyone can help is? I'm new to verilog. Module D_FF (clerk, d, reset_n, q); Input D, Clack, reset_en; Output Q; reg Q; lab4_gdl f1 (.lk (~ clk), d (d), .q.m (qm)); lab4_GDL f2 (.Clk (Clk), D (QM), .Q (Q)); Always start at @ (posedge clk, neggeous reset_n) (Reset_n == 0) Q & lt; = 0; Other questions & lt; = D; Edit End: The problem is what we are asking to do: In this section, you apply the memory / registration circuit on the AlterEdie 2 board. will do. The circuit has the following specifications: The present value of swift SW15-0 on the D2 board should be shown in four hexadecimal four sections of HEX3-0. This part of the circuit will be combination logic. To use an active-less asynchronous reset and KEY1 to use KEY0 as the clock input, you must store SW15-0in in a 16-bit register in the value The register should be enabled to have a 16-bit positive edge, which uses the embedded D flip-flo
Read more

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon
Read more