Question

我在下面有一个PostgreSQL表：

 id |                       market                       |  process   | lines | items 
----+----------------------------------------------------+------------+-------+-------
  1 | Spain                                              | Pick       |    25 |   100
  2 | Spain                                              | Pick       |    50 |   100
  3 | UK                                                 | Pick       |   100 |   100
  4 | USA                                                | Pick       |    75 |    90
  5 | Metz                                               | Pick       |    10 |    20
  6 | UK                                                 | Pick       |    76 |    90
  7 | ROW                                                | Pick       |   200 |   300
  8 | Russia                                             | Pick       |   150 |  1000
  9 | South Africa                                       | Pick       |    35 |    50
 10 | Uk                                                 | Pick       |    15 |    20
 11 | USA                                                | Pick       |   123 |   123
 12 | Spain                                              | Pack       |    25 |    25
 13 | Spain                                              | Pack       |    50 |   100
 14 | UK                                                 | Pack       |   100 |   100
 15 | USA                                                | Pack       |    75 |    90
 16 | Metz                                               | Pack       |    10 |    20
 17 | UK                                                 | Pack       |    76 |    90
 18 | ROW                                                | Pack       |   200 |   300
 19 | Russia                                             | Pack       |   150 |  1000
 20 | South Africa                                       | Pack       |    35 |    50
 21 | Uk                                                 | Pack       |    15 |    20
 22 | USA                                                | Pack       |   123 |   123

我需要的是在过程显示“ Pack”时获取lines列的总和，然后使用PHP在HTML页面上的表中显示总和。我已经通过终端验证了SELECT SUM(lines) FROM jobs WHERE process='Pick';代码，并且该代码有效，因此我将其放入了pg_query中。但是我无法在页面上显示总和。

我已经篡改了我已经获得的代码，该代码可以显示所有符合条件的数据，但是我无法使其正常工作。代码如下：

<?php 
    $db = pg_connect("host=localhost dbname=vcbv2 user=postgres");
    $result2 = pg_query($db, "SELECT SUM(lines) FROM jobs WHERE process='Pick'");
    echo "<table border='1'>";
    echo "<tr><td>PICK LINES TO DO</td></tr>\n";
    while ($row = pg_fetch_assoc($result2)) {
        echo"<tr><td>{$row['$result2']}</tr>\n";
    }
    echo"</table>";
?>

Answer 1

需要对您的代码进行一些小的更改

<?php 
  $db = pg_connect("host=localhost dbname=vcbv2 user=postgres");
  $result2 = pg_query($db, "SELECT SUM(lines) as total FROM jobs WHERE process='Pick'");
  echo "<table border='1'>";
        echo "<tr><td>PICK LINES TO DO</td></tr>\n";
            while ($row = pg_fetch_assoc($result2))
              {
              echo"<tr><td>{$row['total']}</tr>\n";
              }
       echo"</table>";
?>

这应该可以解决问题。在这里，您已经根据查询中的where条件添加了列。

在另一列中满足条件时显示一列的总和

1 个答案: