Question

我试图使用我在我的数据库中使用的数据创建一个表，并使用php代码查看每个城镇的pop并将它们全部添加到每天获取告知的pop，然后告诉pop并查找上次更改pop的时间并输出该数据并按上次更改时更改。任何帮助都会很棒

现在显示的内容

+-----------+------------+---------------+-----------------------+
| Last_time_pop_changed  | Player_name   |total_population_change|
+-----------+------------+---------------+-----------------------+
| 2016-02-07 00:03:46    | .Mjölnir.     |                 383846|
| 2016-02-08 00:03:25    | .Mjölnir.     |                 384309|
| 2016-02-09 00:03:30    | .Mjölnir.     |                 384347|
| 2016-02-10 00:04:09    | .Mjölnir.     |                 384374|
| 2016-02-11 00:03:29    | .Mjölnir.     |                 385163|
| 2016-02-12 00:02:51    | .Mjölnir.     |                 385173|
| 2016-02-13 00:02:59    | .Mjölnir.     |                 385190|
| 2016-02-14 00:03:12    | .Mjölnir.     |                 385904|
| 2016-02-15 00:04:11    | .Mjölnir.     |                 386217|
| 2016-02-16 00:03:58    | .Mjölnir.     |                 386254|
| 2016-02-17 00:03:39    | .Mjölnir.     |                 386295|
| 2016-02-07 00:03:46    |  Rebellions   |                  23084|
| 2016-02-08 00:03:25    |  Rebellions   |                  22382|
| 2016-02-09 00:03:30    |  Rebellions   |                  22382|
| 2016-02-10 00:04:09    |  Rebellions   |                  22382|
| 2016-02-11 00:03:29    |  Rebellions   |                  22382|
| 2016-02-12 00:02:51    |  Rebellions   |                  22382|
| 2016-02-13 00:02:59    |  Rebellions   |                  22382|
| 2016-02-14 00:03:12    |  Rebellions   |                  22382|
| 2016-02-15 00:04:11    |  Rebellions   |                  22382|
| 2016-02-16 00:03:58    |  Rebellions   |                  22382|
| 2016-02-17 00:03:39    |  Rebellions   |                  22382|   
+-----------+------------+---------------+-----------------------+

我想要展示的内容

+-----------+------------+---------------+-----------------------+
| Last_time_pop_changed  | Player_name   |total_population_change|
+-----------+------------+---------------+-----------------------+
| 2016-02-08 00:03:25    |  Rebellions   |                   -702|
| 2016-02-16 00:03:58    | .Mjölnir.     |                     41|
+-----------+------------+---------------+-----------------------+

PHP代码

$sql="SELECT players.*, town_deltas.*, town_deltas.town_id, sum( town_deltas.population ) as total_population  FROM `town_deltas` LEFT JOIN players ON town_deltas.owner_id = players.player_id  GROUP BY owner_id, data_timestamp ORDER BY `town_deltas`.`town_id` ASC, `town_deltas`.`data_timestamp` ASC";
$result = mysqli_query($con,$sql);
echo "<table>
<tr>

<th>Last_time_pop_changed</th>

<th>Player_name</th>


<td>total_population_change</td>

</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";


echo "<td>" . $row['data_timestamp'] . "</td>";

echo "<td>" . $row['Player_name'] . "</td>";


echo "<td>" . $row['total_population'] . "</td>";


echo "</tr>";
}

Town Deltas

                primary_key :id
                DateTime :happened_at
                Integer :town_id, :index => true
                Integer :owner_id, :index => true
                String :name, :index => true
                Integer :population
                TrueClass :is_capital
                TrueClass :is_alliance_capital

玩家表

            Integer :player_id, :primary_key => true
            foreign_key :race_id, :races
            Integer :alliance_id, :null => true
            Integer :alliance_role_id, :null => true
            String :Player_name, :index => true

Answer 1

我能想到的最好的方法是用

一次循环一个名字

    select data_timestamp,sum(total_population_change) from (select * from town_deltas where Player_name  = name limit 2) as t;

显示总人口变化并按最后一次更改pop进行排序

1 个答案: