How to write Android SQLite INTERSECT database

I am trying to query Android SQLite database using the following INTERSECT query, but it fails. The two select queries work fine on their own and they definitely produce a consistent result, so I can't figure out why the INTERSECT statement won't work:

SQLiteDatabase db = (new DatabaseHelper(this)).getWritableDatabase();
Cursor cursor = db.rawQuery("SELECT tblsyndromes._id, synname" +
"  FROM tblsyndromes JOIN tblsymsynlink ON tblsymsynlink.synId =      tblsyndromes._id" +
" WHERE tblsymsynlink.symId = "+intCondition+" " +
" INTERSECT SELECT tblsyndromes._id, synname FROM tblsyndromes JOIN synconlink" +
" ON synconlink.synId = tblsyndromes._id" +
" WHERE synconlink.conId = "+intCondition2+"", null);

      

The new code I am using is -

String sqlString = "SELECT tblsyndromes._id, tblsyndromes.synname FROM tblsyndromes       JOIN synconlink ON synconlink.synId = tblsyndromes._id WHERE synconlink.conId = 55 INTERSECT SELECT tblsyndromes._id, tblsyndromes.synname FROM tblsyndromes JOIN tblsymsynlink ON tblsymsynlink.synId = tblsyndromes._id WHERE tblsymsynlink.symId = 136";

SQLiteDatabase db = (new DatabaseHelper(this)).getWritableDatabase();

Cursor cursor = db.rawQuery(sqlString,null);

ArrayList<String> mArrayList = new ArrayList<String>();
cursor.moveToFirst();
while(!cursor.isAfterLast()) {
     mArrayList.add(cursor.getString(cursor.getColumnIndex("synname")));
     cursor.moveToNext();
}

      

I have tested sql repeatedly using sqlite3 and it works - both select queries work independently of android, but as soon as I try to use INTERSECT I get a crash - now I get the following error.

Bad query for field slot 0, -1. numRows = 3, numColumns = 2

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public Long insert_todoinfo(String a, String b, String c, String d,
            String e, String f, String g) {
        // TODO Auto-generated method stub
        ContentValues con = new ContentValues();
        con.put("title", a);
        con.put("description", b);
        con.put("category", e);
        con.put("due_date", c);
        con.put("alarm_time", d);
        con.put("alarm_set", f);
        con.put("priority", g);
        con.put("parform", "false");
        return mDb.insert(DATABASE_TABLE_TODO_LIST, null, con);
    }

      



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