how to use DISTINCT here in my query CODEIGNITER

Question

$q = $this->db->select(\'
             books.title,
             reserved_books.id,
             reserved_books.isbn, 
             reserved_books.price,
              


        

Answer 1

Here is a way to do this

$select =   array(
             'books.title',
             'reserved_books.id',
             'DISTINCT reserved_books.isbn', 
             'reserved_books.price',
             'reserved_books.item_sold',
             'reserved_books.date_sold',
             'reserved_books.total_amount'
);
$q = $this->db
        ->select($select)
        ->from('reserved_books')
        ->join('books','reserved_books.isbn= books.isbn')
        ->group_by('reserved_books.isbn')
        ->limit($limit,$offset);