I need help on a query regarding fetching data from a database file











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I have a database where a lot of sensors are sending data. I need to extract the most recent data from Pin 21,20,16,12.
I have written this query but so far it only returns me the last 4 values of the database and not the latest from from all of these pins. What am I doing wrong?Output of my query



select * from Temperature where Pin in (21,20,16,12) and Module =1 order by S_No desc limit 4


Click here to download Database file






database sqlite sqlite3







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    I have a database where a lot of sensors are sending data. I need to extract the most recent data from Pin 21,20,16,12.
    I have written this query but so far it only returns me the last 4 values of the database and not the latest from from all of these pins. What am I doing wrong?Output of my query



    select * from Temperature where Pin in (21,20,16,12) and Module =1 order by S_No desc limit 4


    Click here to download Database file






    database sqlite sqlite3







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a database where a lot of sensors are sending data. I need to extract the most recent data from Pin 21,20,16,12.
      I have written this query but so far it only returns me the last 4 values of the database and not the latest from from all of these pins. What am I doing wrong?Output of my query



      select * from Temperature where Pin in (21,20,16,12) and Module =1 order by S_No desc limit 4


      Click here to download Database file






      database sqlite sqlite3







      share|improve this question













      I have a database where a lot of sensors are sending data. I need to extract the most recent data from Pin 21,20,16,12.
      I have written this query but so far it only returns me the last 4 values of the database and not the latest from from all of these pins. What am I doing wrong?Output of my query



      select * from Temperature where Pin in (21,20,16,12) and Module =1 order by S_No desc limit 4


      Click here to download Database file






      database sqlite sqlite3




      database sqlite sqlite3






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked yesterday









      Usman Khan

      475




      475
























          1 Answer
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          The answer was to add group by Pin on the end.



          select * from Temperature where Pin in (21,20,16,12) and Module =1 group by Pin


          I am so stupid






          share|improve this answer





















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            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            0
            down vote













            The answer was to add group by Pin on the end.



            select * from Temperature where Pin in (21,20,16,12) and Module =1 group by Pin


            I am so stupid






            share|improve this answer

























              up vote
              0
              down vote













              The answer was to add group by Pin on the end.



              select * from Temperature where Pin in (21,20,16,12) and Module =1 group by Pin


              I am so stupid






              share|improve this answer























                up vote
                0
                down vote










                up vote
                0
                down vote









                The answer was to add group by Pin on the end.



                select * from Temperature where Pin in (21,20,16,12) and Module =1 group by Pin


                I am so stupid






                share|improve this answer












                The answer was to add group by Pin on the end.



                select * from Temperature where Pin in (21,20,16,12) and Module =1 group by Pin


                I am so stupid







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered yesterday









                Usman Khan

                475




                475






























                     

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