[eluser]theknight[/eluser]
[quote author="theknight" date="1311361638"]
Code:
//SQL to get child ID
$this->db->select("SupplyRequirements.Id, DateParentEmailed, SupplyItem_Id, Child_Id");
//joins the two tables
$this->db->join('SupplyRequirements', 'SupplyRequirements.SupplyItem_Id=SupplyItems.Id');
$this->db->group_by("Child_Id");
$query = $this->db->get_where("SupplyItems",'DateParentEmailed=Null');
$details = $query->result_array();
I get the following error:
A Database Error Occurred
Error Number:
Column 'SupplyRequirements.Id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
SELECT SupplyRequirements.Id, DateParentEmailed, SupplyItem_Id, Child_Id FROM SupplyItems JOIN SupplyRequirements ON SupplyRequirements.SupplyItem_Id=SupplyItems.Id WHERE DateParentEmailed=Null GROUP BY Child_Id
Cheers/[/quote]
Nevermind this is not what I am looking for, basically I have written a SQL query that returns the foreign key child_id
4
4
3
3
1
There are duplicate foreign keys 4,4,3,3. Now I want it to return the child_id without duplicates like this:
4
3
1
How could I do this?
