在codeigniter中使用distinct选择多列

Question

This is model.php

function get_data_wheree($table)
{
    $this->db->select('course_offrd_name','collg_id');
    $this->db->distinct('');

    return $this->db->get('tbl_course_offered')->result();
}

Here I want to use multiple columns course_offrd_name and collg_id using one columns as DISTINCT keywords and second as normal select. but I'm only able to select course_offrd_name and not able to print collg_id. how to print both the columns with one distinct and one normal select. course_offrd_name as DISTINCT and collg_id as normal select I have made the query simple. How do I solve the issue in the code?

Answer 1

Try to use the distinct like this :

function get_data_wheree($table)
{
    $this->db->distinct('course_offrd_name');
    $this->db->select('collg_id');

    return $this->db->get('tbl_course_offered')->result();
}

Or you can also use a GROUP BY :

function get_data_wheree($table)
{
    $this->db->select('course_offrd_name, collg_id');
    $this->db->group_by('course_offrd_name');

    return $this->db->get('tbl_course_offered')->result();
}