我早些时候问过一个有关如何执行此查询的问题,并收到了好评。不幸的是,它比我通常运行的查询要先进一些,因此我无法弄清楚如何检索结果并将其显示在我的网页上。这是原始问题的链接original question
<!-- Data list table -->
<table class="table table-bordered">
<thead class="thead-dark">
<tr>
<th>Name</th>
<th>Jan</th>
<th>Feb</th>
<th>Mar</th>
<th>Apr</th>
<th>May</th>
<th>Jun</th>
<th>Jul</th>
<th>Aug</th>
<th>Sep</th>
<th>Oct</th>
<th>Nov</th>
<th>Dec</th>
<th>AVG</th>
</tr>
</thead>
<tbody>
<?php
$result = $db->query("SELECT name,
COALESCE(AVG(CASE WHEN mth = 1 THEN PTS END), 0) AS Jan,
COALESCE(AVG(CASE WHEN mth = 2 THEN PTS END), 0) AS Feb,
COALESCE(AVG(CASE WHEN mth = 3 THEN PTS END), 0) AS Mar,
COALESCE(AVG(CASE WHEN mth = 4 THEN PTS END), 0) AS Apr,
-- repeat for May to November
COALESCE(AVG(CASE WHEN mth = 12 THEN PTS END), 0) AS `Dec`,
AVG(PTS) AS AVG
FROM (
SELECT Name, PTS AS PTS, MONTH(STR_TO_DATE(DATE, '%a %b %e %H:%i:%s %Y')) AS mth
FROM data
) d
GROUP BY name");
while($row = mysqli_fetch_array($result)) {
?>
<tr>
<td><?php echo $row[Name]; ?></td>
<td class = "gScore-<?php echo $row[Jan]; ?>"></td>
<td class = "gScore-<?php echo $ptsFeb; ?>"></td>
<td class = "gScore-<?php echo $ptsMar; ?>"></td>
<td class = "gScore-<?php echo $ptsApr; ?>"></td>
<td class = "gScore-<?php echo $ptsMay; ?>"></td>
<td class = "gScore-<?php echo $ptsJun; ?>"></td>
<td class = "gScore-<?php echo $ptsJul; ?>"></td>
<td class = "gScore-<?php echo $ptsAug; ?>"></td>
<td class = "gScore-<?php echo $ptsSep; ?>"></td>
<td class = "gScore-<?php echo $ptsOct; ?>"></td>
<td class = "gScore-<?php echo $ptsNov; ?>"></td>
<td class = "gScore-<?php echo $ptsDec; ?>"></td>
<td><?php echo $avgGrade; ?></td>
</tr>
<?php
}
您有几个问题:
$row
的索引需要用引号引起来,例如$row['name']
否则,您将收到很多“未定义的常量”警告;$row['Jan']
是检索月度数据的正确方法,您需要复制其他每个月的数据;$avgGrade
替换$row['AVG']
<td class = "gScore-<?php echo $row[Jan]; ?>"></td>
您实际上要不要
<td class = "gScore"><?php echo $row[Jan]; ?></td>
-- repeat for May to November
行添加到查询中,即 $result = $db->query("SELECT name,
COALESCE(AVG(CASE WHEN mth = 1 THEN PTS END), 0) AS Jan,
COALESCE(AVG(CASE WHEN mth = 2 THEN PTS END), 0) AS Feb,
COALESCE(AVG(CASE WHEN mth = 3 THEN PTS END), 0) AS Mar,
COALESCE(AVG(CASE WHEN mth = 4 THEN PTS END), 0) AS Apr,
COALESCE(AVG(CASE WHEN mth = 5 THEN PTS END), 0) AS May,
COALESCE(AVG(CASE WHEN mth = 6 THEN PTS END), 0) AS Jun,
COALESCE(AVG(CASE WHEN mth = 7 THEN PTS END), 0) AS Jul,
COALESCE(AVG(CASE WHEN mth = 8 THEN PTS END), 0) AS Aug,
COALESCE(AVG(CASE WHEN mth = 9 THEN PTS END), 0) AS Sep,
COALESCE(AVG(CASE WHEN mth = 10 THEN PTS END), 0) AS Oct,
COALESCE(AVG(CASE WHEN mth = 11 THEN PTS END), 0) AS Nov,
COALESCE(AVG(CASE WHEN mth = 12 THEN PTS END), 0) AS `Dec`,
AVG(PTS) AS AVG
FROM (
SELECT name, PTS AS PTS, MONTH(STR_TO_DATE(DATE, '%a %b %e %H:%i:%s %Y')) AS mth
FROM data
) d
GROUP BY name");