sql - PHP - get beginning inventory from ending inventory of last month -


i have orders table , inventory table. need function beginning inventory of last month.

this formula.

beginning inventory = ending inventory

ending inventory = beginning inventory + deliveries - usage.

to ending inventory of last month, need beginning inventory of last last month don't know how that.

i thinking on how it.

    <?php      function get_beginning_inventory($month_date)      {        //do formula here or code here        return $data;      }     ?>

can me please?


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