Question

i am using cursor for retrieving data from database but problem is that i have no. of records for same date and i want only one record date wise and related Tamt of date will be added to amount field:

I have database records like :

Sr    ExpName       Date       Camt  Tamt
---   --------- -----------   ----- -----
1     Pen        10-10-2012      10    10
2     abc        10-10-2012      30    45
3     xyz        11-10-2012      15    55
4     ggg        11-10-2012      20    75
5     aaa        11-10-2012      10    85
6     nnn        11-10-2012      10    95


 dbhelper = new DbHelper(this);
 db = dbhelper.getReadableDatabase();

    Cursor c = db.query(DbHelper.TABLE_NAME, new String[]{"CAST(Date AS DATE)","SUM(Tamt) AS AMT"}, null, null,"CAST(Date AS DATE)", null, null);
    adapter = new SimpleCursorAdapter(this, R.layout.myrow1, c, new String[]{DbHelper.C_Date,DbHelper.C_Tamt},new int[]{R.id.textView3,R.id.textView5} );
    startManagingCursor(c);     
    lstExpense.setAdapter(adapter); 

where myrow1 is a layout file in and TextView3 and TextVew5 field where i want to display output DATE and AMOUNT.

And i want ouput like this:

DATE             AMOUNT
------------     ------
10-10-2012          40
11-10-2012          35
12-10-2012          10
13-10-2012          10

Answer 1

This sounds like a problem for GROUP BY and the SUM aggregation function.

Working with SQLite directly your query would need to be along the lines of

SELECT Date, SUM(Camt) AS Amount FROM Expenses GROUP BY Date;

(I’ve assumed that your database table is called Expenses.)

Converting this into an Android cursor query is then pretty simple

Cursor c = db.query("Expenses", 
    new String[] { "Date", "SUM(Camt) AS Amount" }, 
    null, null, "Date", null, null, null);

That should give you the result that you’re looking for.