CodeIgniter Query Builder: WHERE NOT NULL

CodeIgniter is a popular PHP framework that provides a Query Builder Library to help developers easily construct SQL queries. One of the common tasks is to select records where a particular column is not null.

In CodeIgniter Query Builder, you can use the where_not_null method to achieve this. Here's an example:

$this->db->select('*');
$this->db->from('users');
$this->db->where_not_null('email');
$query = $this->db->get();
$result = $query->result();

This code will select all columns from the users table where the email column is not null.

You can also use or_where_not_null and where_not_null_in methods to handle more complex queries:

$this->db->select('*');
$this->db->from('users');
$this->db->where_not_null('email');
$this->db->or_where_not_null('phone');
$this->db->where_not_null_in('status', array('active', 'pending'));
$query = $this->db->get();
$result = $query->result();

This code will select all columns from the users table where either the email or phone column is not null, and the status column is either "active" or "pending".

In addition to these methods, CodeIgniter Query Builder provides many other useful methods for constructing SQL queries. You can refer to the official documentation for more information:

https://codeigniter.com/user_guide/database/query_builder.html

Using CodeIgniter Query Builder, you can easily construct SQL queries without worrying much about the syntax. This makes your code easier to read and maintain in the long run.