我遇到了麻烦,我的PHP,你可以看到,我有一个数据库中的重复名称(老师的第一/姓和学生的姓/名)2行。 当我使用它下面这段代码显示了这个网页上Sql中的重复行标题。在PHP中打印
SubjectID: 1
Subject name: English
Teacher First Name: TeachFirst1
Teacher Last Name: TeachLast1
Class List
Student First Name: TeachFirst1
Student Last Name: TeachLast1
我怎么能指定,我想最后2行打印学生的第一/姓氏?不是老师。我知道为什么印刷老师。我只是希望它被指定
<?php
$sql2 = 'SELECT `students`.`FirstName`, `students`.`LastName`, `subjects`.`SubjectName`, `subjects`.`SubjectNo`, `teachers`.`FirstName`, `teachers`.`LastName`
FROM `students`
INNER JOIN `timetable` ON `students`.`StudentID`=`timetable`.`StudentID`
INNER JOIN `subjects` ON `timetable`.`Subject`=`subjects`.`SubjectNo`
INNER JOIN `teachers` ON `subjects`.`TeacherID`=`teachers`.`TeacherID`
WHERE `timetable`.`subject`="1"';
$results2 = $conn->query($sql2);
if($results2->num_rows > 0){
while ($row=$results2->fetch_assoc()) {
echo "<br/>".
"<b>"."SubjectID: "."</b>".$row["SubjectNo"]. "<br/>".
"<b>"."Subject name: "."</b>".$row["SubjectName"]. "<br/>".
"<b>"."Teacher First Name: "."</b>".$row["FirstName"]. "<br/>".
"<b>"."Teacher Last Name: "."</b>".$row["LastName"]. "<br/>".
"<b>"."Class List"."</b>"."<br/>".
"<b>".'Student First Name: '."</b>".$row["FirstName"]. "<br/>".
"<b>".'Student Last Name: '."</b>".$row["LastName"]. "<br/>"
;
}
}
?>
首先做'$ arrResult = $ results2->使用fetchall的'print_r'或'var_dump'();''随后的var_dump ($ arrResult)'。通过这样做,你会得到一些线索来解决你的问题。 –
请参阅https://meta.stackoverflow.com/questions/333952/why-should-i-provide-an-mcve-for-what-seems-to-me-to-be-a-very-simple-sql-询问 – Strawberry