mysql纵列改成恒列_php-如何将mysql表行显示为列
我有两个表,结果和GP.
在结果表中,我有类似以下内容：
|id||student_id ||course_code||grade||session ||level||semester|
|1 ||TR/2213234561||MAT111 ||A ||2009/2010||100 ||first |
|2 ||TR/2213234561||MAT112 ||B ||2009/2010||100 ||first |
|3 ||TR/2213234561||MAT113 ||C ||2009/2010||100 ||first |
|4 ||TR/2213234567||MAT111 ||D ||2009/2010||200 ||first |
|5 ||TR/2213234567||MAT112 ||C ||2009/2010||200 ||first |
|6 ||TR/2213234567||MAT113 ||C ||2009/2010||200 ||first |
然后gp表
|id||student_id ||session ||level||semester||gp |
|1 ||TR/2213234561||2009/2010||100 ||first ||4.2|
|2 ||TR/2213234567||2009/2010||100 ||first ||3.5|
|3 ||TR/2213234561||2010/2011||200 ||first ||4.2|
|4 ||TR/2213234567||2010/2011||200 ||first ||3.5|
我想要的是这样的：
|Matriculation||MAT111||MAT112||MAT113||MAT114||GP |
|TR/2213234561||A ||B ||D ||C ||4.2|
|TR/2213234567||C ||D ||E ||F ||3.5|
课程代码不是恒定的-取决于学生注册的课程
我已经做到了：
$rst1 = mysql_query("select distinct course_code from result ", $conn);
echo "
echo "
";echo "
Matriculation Number ";$c_code = array();
while ($row = mysql_fetch_array($rst1))
{
$c_code[] = $row['course_code'];
}
foreach($c_code as $c_code)
{
echo "
" .$c_code. "";}
$sql ="SELECT result.student_id,
MAX(CASE WHEN course_code = ' $c_code' THEN grade END) $c_code,
gp.CTC
FROM result
JOIN gp
ON gp.student_id = result.student_id
GROUP
BY student_id";
echo "
GP";$rst = mysql_query("$sql",$conn) or die(mysql_error());
while ($row = mysql_fetch_array($rst))
{
echo "
";echo "
";echo "
" .$row['student_id']. "";echo "
" .$row[$c_code]. "";}
echo "
" .$row[$c_code]. "";echo "
" .$row['CTC']. "";echo"
";echo "
";?>
第一个查询是获取课程代码,因为课程不是常数.
有了该代码,我得到了这样的东西：
|Matriculation||MAT111||MAT112||MAT113||MAT114||GP|
|TR/2213234561|
|TR/2213234567|
但是我想要
|Matriculation||MAT111||MAT112||MAT113||MAT114||GP |
|TR/2213234561||A ||B ||D ||C ||4.2|
|TR/2213234567||C ||D ||E ||F ||3.5|
任何建议或方向将不胜感激.