从输出中删除重复行 table

Question

我想删除 table 中的重复输出，table 看起来像这样

Order No  Customer Name  Order
1001       John          Milk
1001       John          Egg
1002       Mark          Milk
1002       Mark          Bread

我想要这样

Order No  Customer Name  Order
1001       John          Milk
                         Egg
1002       Mark          Milk
                         Bread

订单号和客户名称使用rowspan = 2

客户和订单来自我数据库中的不同table

这个table的查询来自一个内连接查询join the two

$query = mysql_query("select customer.customerName, order.orderNo, order.item 
from customer inner join orderInfo on orderInfo.customerId = customer.customerId");

while($order = mysql_fetch_assoc($query))
{
 echo '<tr>
  <td>'.$order['orderNo'].'</td>
  <td>'.$order['customerName'].'</td>
  <td>'.$order['item'].'</td>
 </tr>';
}

上面代码的输出就是第一个例子

我如何实现第二个插图，我的 table 关系有问题还是我应该使用正确的查询？

Answer 1

正如 jarl 所说，这不是 dbms 要做的事情，按顺序编辑查询并使用下面的代码作为第二个示例

$previous=-1000;
while ($row = mysql_fetch_assoc($query)
{
if($previous!=$row['orderNo'])
{
echo "<tr><td>".$row['orderNo']."</td>";
echo "<td>".$row['customerName']."</td>";
echo "<td>".$row['item']."</td>";
}
else
{
echo "<tr><td></td><td></td><td>".$row['item']."</td>";
}
$previous=$row['orderNo'];
}

Answer 2

你最好使用 group_concat:

$query = mysql_query("
SELECT 
    customer.customerId, customer.customerName, order.orderNo, group_concat(order.item SEPARATOR ',') as order_items
FROM 
    customer
INNER JOIN
    orderInfo on orderInfo.customerId = customer.customerId
GROUP BY customer.customerId
");

并且在您的代码中，只需替换分隔符：

while($order = mysql_fetch_assoc($query))
{
 echo '<tr>
  <td>'.$order['orderNo'].'</td>
  <td>'.$order['customerName'].'</td>
  <td>'.str_replace(',','<br/>',$order['item']).'</td>
 </tr>';
}

在这种情况下，您不需要 rowspan=2。

Answer 3

如果您的数据不是动态的，您可以使用以下方法：

DECLARE @varTable TABLE (OrderNo NVARCHAR(10), CustomerName NVARCHAR(60), Order NVARCHAR(60))

INSERT INTO @varTable VALUES( CAST(1001 AS NVARCHAR(10)),   'John', 'Milk')
INSERT INTO @varTable VALUES( '',                           '',     'Egg')
INSERT INTO @varTable VALUES( CAST(1002 AS NVARCHAR(10)),   'Mark', 'Milk')
INSERT INTO @varTable VALUES( '',                           '',     'Bread')

SELECT * FROM @varTable

Answer 4

检查此查询：

Select Dep, Case
             When rn = 1 And c_d > 1 Then
              d
             When c_d = 1 Then
              d
             Else
              Null
           End D1,
           Case
             When rn = 1 And c_k > 1 Then
              k
             When c_k = 1 Then
              k
             Else
              Null
           End K1,
           Case
             When rn = 1 And c_m > 1 Then
              m
             When c_m = 1 Then
              m
             Else
              Null
           End M1
      From (Select Count(1) Over(Partition By d,dep Order By d) c_d,
                   Count(1) Over(Partition By k,dep Order By k) c_k,
                   Count(1) Over(Partition By m,dep Order By m) c_m,
                   row_number() Over(Partition By dep Order By dep)rn,
                   d,
                   k,
                   m,
                   Dep
              From (Select 'ali' d, '1000' k, 'M' m, 'x' Dep
                      From Dual
                    Union
                    Select 'ali' d, '1000' k, 'H' m, 'x' Dep
                      From Dual
                    Union
                    Select 'ali' d, '1001' k, 'M' m, 'y' Dep
                      From Dual
                    Union
                    Select 'ali' d, '1000' k, 'H' m, 'y' Dep
                      From Dual))

从输出中删除重复行 table

Remove duplicate row from output table

php

sql

html-table

inner-join