使用mysqli从数据库中选择，分组和求和结果

Question

我有一个有customerId，GroupId，amountContributed的记录，该记录每天捕获一次，现在我想返回一个表，显示具有组id的客户贡献的总金额。我之前的代码是：

if(isset($_POST["searchVal"])){
//$searchText = $_POST["searchText"];
$sDate = $_POST["sDate"];
$eDate = $_POST["eDate"];
$query = mysqli_query($connection,"SELECT custid,grpid,amountContribute FROM tab_customer_dailycontribution WHERE cast(transactionDate as date) BETWEEN '$sDate' AND '$eDate'");
if($connection->affected_rows>0){
    $c =0;$con =0.00;

while($rw = mysqli_fetch_array($query)){
    $c++;?> 
    <tr>
    <td><?php echo $c;?></td>
    <td><?php echo $rw['custid'];?></td>
    <td><?php echo $rw['grpid'];?></td>
    <?php $con+=$rw['amountContribute']; ?>
    <td><?php echo number_format($con,2);?></td>
  <?php  } ;?>
   </tr>
   <tr>

上面给出了这个表：

S/N CustomerID  Group ID    Total Contribution
    1   SC20151 SGC20151    700.00
    2   SC20151 SGC20151    500.00
    3   SC20151 SGC20151    500.00
    4   SC20152 SGC20151    500.00
    5   SC20152 SGC20151    500.00
    6   SC20152 SGC20151    500.00
    7   SC20152 SGC20151    500.00
    8   SC20152 SGC20151    500.00
    9   SC20152 SGC20151    500.00
    10  SC20152 SGC20151    500.00
    11  SC20152 SGC20151    500.00
    12  SC20152 SGC20151    500.00
    13  SC20152 SGC20151    500.00
    14  SC20153 SGC20152    1,000.00
    15  SC20153 SGC20152    1,000.00

因此，我希望输出如下表所示：

 SN        Customer ID      Group ID       Amount Conributed
    1         SC20152           SCG20151        5000
    2         SC20151           SCG20151        1200
    3         SC20153           SCG20152        2000 

有人可以帮忙吗？ 我已经使用了按客户ID分组，已贡献金额但无法正常工作。

Answer 1

SELECT custid, grpid, SUM(amountContribute) AS sumAmountContribute
FROM tab_customer_dailycontribution 
WHERE CAST(transactionDate AS date) BETWEEN '$sDate' AND '$eDate'"
GROUP BY custid, grpid

会给你你所需要的。

输出时，您将不得不更改数组索引：

<?php echo $rw['sumAmountContribute']; ?>