使用php mysql查找不同商店/仓库中每个产品的SUM

Question

我想要支持找到2个不同商店中每个产品的总数量，你可以通过使用Php看到下面的两个表。

我试过的这段代码不起作用，但是它让我得到了你在第二个输出表上看到的唯一的Product，但不是每个商店的总数

       <table class="table" id="manageStockStatus">
                <thead>
                    <tr>

                        <th>Product Name</th>


                        <th>Qty-office</th>
                        <th>Qty-Yard</th>
                        <th>T-Qyt</th>
                        <th>Size/Type</th>

                    </tr>
                <?php

    $sql = "SELECT  SUM(quantity) AS Tq, (SELECT product_name 
 from product where stock.product_id=product_id) as pname FROM `stock` GROUP BY product_id ";
                 $result = $connect->query($sql);

               while($row = $result->fetch_array()) {
               $Productname=$row['pname'];
               $Tqnty=$row['Tq'];
                // $Tqnty=$row['Tq'];
                // $office=$row[];
                // $yard=$row['yard'];

               ?>
                </thead>

    <td><?php echo $Productname;?> </td>
    <td><!-- <?php echo $office;?> --></td>
    <td><!-- <?php echo $yard;?> --></td>
    <td><span class="badge"><?php echo $Tqnty; ?></span></td>
    <td></td>

    </tr> 

     <?php }?>
    </table>
    <!-- /table -->

</div> <!-- /panel-body -->
</div> <!-- /panel -->      
</div> <!-- /col-md-12 -->

Answer 1

尝试使用左JOIN并执行group by stock.product_id,store：

SELECT  stock.product_id as id,product_name as pname,store,SUM(quantity) AS Tq
FROM `stock` left join product on stock.product_id=product.product_id
group by stock.product_id,store

这样，在你的while循环中你可以：

       while($row = $result->fetch_array()) {
           $Productname=$row['pname'];
           $Tqnty=$row['Tq'];
           $office=$row['store']; 
       ?>

编辑

然后您可以像这样使用CASE：

SELECT  stock.product_id as id,product.product_name as pname,
        sum(case 
                when store=1 then quantity
                else 0
            end) as office,
        sum(case 
                when store=2 then quantity
                else 0
            end) as yard
FROM `stock`  left join product on stock.product_id=product.product_id
group by stock.product_id,product.pname

这样，在你的while循环中你可以：

       while($row = $result->fetch_array()) {
           $Productname=$row['pname'];
           $yard=$row['yard']; 
           $office=$row['office']; 
           $Tqnty=$office+$yard;
       ?>