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Home Backend Development PHP Tutorial GROUP BY 语句怎么用php输出来类

GROUP BY 语句怎么用php输出来类

Jun 23, 2016 pm 01:59 PM

数据库 tabel 中有 `chengji` 字段 内容为 及格 不及格 良好 三种值
页面显示出三种值的统计数
我用

SELECT `chengji`,count(*) FROM `table` GROUP BY `chengji`
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在Mysql 中可以出来 可是要怎么显示到php文件中那

页面样子为
| 不及格 | 及格 | 良好 |
数量 | | | |


回复讨论(解决方案)

$sql = SELECT `chengji`,count(*) AS count FROM `table` GROUP BY `chengji`
在php中把mysql_query($sql);的结果打印出来看看

$sql = SELECT `chengji`,count(*) AS count FROM `table` GROUP BY `chengji`
在php中把mysql_query($sql);的结果打印出来看看

结果是Resource id #5

$sql = SELECT `chengji`,count(*) AS count FROM `table` GROUP BY `chengji`
在php中把mysql_query($sql);的结果打印出来看看

用mysql_fetch_array

结果为Array ( [0] => 及格 [type] => 及格 [1] => 4 [count] => 4 )

用mysql_fetch_array
结果为Array ( [0] => 及格 [type] => 及格 [1] => 4 [count] => 4 )
while($row = mysql_fetch_array()){}


用mysql_fetch_array
结果为Array ( [0] => 及格 [type] => 及格 [1] => 4 [count] => 4 )
while($row = mysql_fetch_array()){}
我明白了 这样和数据库中查询出的格式的一样的
可是我想在页面中做一个固定的table 和数据库中的格式不一样

$sql = SELECT `chengji`,count(*)  AS count FROM `table` GROUP BY `chengji`;$rs = mysql_query($sql);while($row = mysql_fetch_assoc($rs)) {  $res[$row['chengji']] = $row['count'];}print_r($res);
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可以得到类似这样的数组
Array(    [及格] => 4    [不及格] => 1    [良好] => 3)
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然后
$res[''] = '数量';$head = array('', '不及格', '及格', '良好');echo '<table>';echo '<tr><th>' . join('</th><th>', $head) . '</th></tr>';echo '<tr>';foreach($head as $v) echo '<td>' . (isset($res[$v]) ? $res[$v] : '') . '</td>';echo '</tr></table>';
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再问个小问题 怎么用date() 获取 当月 月初 和 月末 日期

再问个小问题 怎么用date() 获取 当月 月初 和 月末 日期

<?phpdate_default_timezone_set("PRC");echo "当前月份是".date("m")."\n";echo "本月初日期是".date("m")."-01\n";echo "本月未日期是".date("m")."-".date("t")."\n";?>
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