Question

I have a DB table with product information, and a DB table with tax rates.

My problem is that I am joining these two tables together, which works great.. until I disable “taxable” on a row for the product DB. Now my query is trying to join, but doesn’t find a foreign key and I get no result at all.. I want to grab a result either way. I am using code igniter syntax, but it should be pretty obvious whats going on here:

    $this->db->from('inventoryTaxRates a');
    $this->db->join('inventory_items q', 'q.inventoryTaxRateID = a.inventoryTaxRateID');

sometimes q.inventyTaxRateID becomes 0, or disabled.. The query cannot join the two tables and gives me no result whatsoever. I want it to still give me the result from inventory_items.

I have tried left joining as well:

 $this->db->join('inventory_items q', 'q.inventoryTaxRateID = a.inventoryTaxRateID', 'left');

Answer 1

You can specify a RIGHT join like this:

$this->db->join('inventory_items q', 
                'q.inventoryTaxRateID = a.inventoryTaxRateID', 
                'right');