select distinct value in android sqlite

Question

I try to run the following raw query in android, it seems not work

String query ="SELECT DISTINCT category FROM event";
Cursor  cursor = mDb.rawQuery(query, null);
if (cursor != null) {
     cursor.moveToFirst();
}
return cursor; 

so I decide to use the query() method in android which are something like

Cursor mCursor = mDb.query(EVENT_TABLE, new String[] {KEY_ROWID, KEY_CAT}, null, null,null,null, null)

Can anyone show me how to select the distinct category for using query() instead of rawquery please, any help will be greatly appreciated!

Answer 1

But you MUST remember to send argument in GROUPBY (NOT NULL send).

You must give column name for distinct.

Example:

Cursor cursor = db.query(true, YOUR_TABLE_NAME, new String[] { COLUMN_NAME_1 ,COLUMN_NAME_2, COLUMN_NAME_3 }, null, null, COLUMN_NAME_2, null, null, null);

true - distinct TRUE

COLUMN_NAME_2 - name column what you have be DISTINCT.

That's works for me fine.