php - Set maximum input number -


my question quite complex. working on loan system. have 2 tables regarding loan module:

  • item
  • loan

when item being loaned, loaned quantity subtracted inventory(item_qty - loan_qty). problem comes @ update loan module. don't know how set maximum quantity. know need add item_qty , loan_qty, can't find way so.

i've googled long time , still stuck. here code:

<?php     $loan_id=$_get['loan_id'];     $acc_query = $con->query("select * `loan` natural join `item` loan_id = '$_request[loan_id]'  ") or die(mysqli_error());     $acc_fetch = $acc_query->fetch_array(); ?>  <div> <form method="post" action="update_loan.php" >     <input type="hidden" name="item_id" value="<?php echo $item_id; ?>">     <input type="hidden" name="loan_id" value="<?php echo $loan_id; ?>">        <div class = "form-group">         <label>quantity</label>         <input name="n_qty" type = "number" id = "n_qty" value= "<?php echo $acc_fetch['qty']?>" class = "form-control" min="1" max="??" />     </div> </div>

table inventory:

  • item_id
  • item_code
  • item_name
  • item_qty

table loan:

  • loan_id
  • item_id
  • loan_qty
  • loaned_place

can use group item_id, item_code, item_name , use sum() function sum of qty both tables: inventory , loan, , subtract desired one.

select i.item_id,i.item_code,i.item_name, (sum(i.item_qty) - sum(l.loan_qty)) resultqty `inventory` natural join `loan` l group i.item_id,i.item_code,i.item_name

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