android - Retrieving the total sum of a table item from a GROUP BY query -


i have 3 tables

private static final string dtreasontable = "create table tb_dtreasons(dtreasonid integer primary key autoincrement,dtreason text)";  private static final string configurationtable = "create table tb_config(configid integer primary key autoincrement," +         "rawmaterialname text,output_pdt text,totalworkhrs real,quantity real,processstarttime real,outputquantity real,procesendtime real)";  private static final string downtimetable = "create table tb_downtimetable(dt_id integer primary key autoincrement,configid integer," +         "starttime real,endtime real,dtreasonid integer)";

i want create report below

enter image description here

can me write procedure corresponding report generation?

  public cursor getdtanalysisreport() {     return this.data.rawquery("select endtime-starttime duration,tb_dtreasons.dtreason,count(tb_downtimetable.dtreasonid) tb_downtimetable" +             " inner join tb_dtreasons on tb_downtimetable.dtreasonid = tb_dtreasons.dtreasonid group tb_downtimetable.dtreasonid ", null);  }

this tried i'm getting error. please me find solution.

select dtreason 'down time reason',        sum(endtime - starttime) 'duration',        sum(endtime - starttime) /        (select sum(endtime - starttime)         tb_downtimetable        ) * 100 '% total down time',        count(*) 'no of occurrences' tb_dtreasons join tb_downtimetable on tb_dtreasons.dtreasonid = tb_downtimetable.dtreasonid group tb_dtreasons.dtreasonid

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