<?php
$inquiry_info='DEFAULT';
$data = array(
                'id_category_id' => $inquiry_info['id_category'],
                'id_type' => $inquiry_info,
            );

            $this->db->insert('Inq_Detail', $data);
            $last_id = $this->db->insert_id();
// O/P
UPDATE `Inq_Detail` SET `id_category_id` = '6319', `id_type` = 'DEFAULT' WHERE `id_id` = '7' 
?>

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