我必须精疲力竭,因为我知道我以前做过这件事,但我不记得我是如何做的,或者是否找到该代码段。我有两个表格“问题”和“答案”。 “questions”中的主要“id”在“答案”中也是“id”。我试图根据该表中的“id”来计算“答案”。从表B中使用ID从表A中计数行php mysql
<?php
$query = "SELECT * FROM questions ORDER BY id DESC";
$result = mysql_query("$query");
while($row = mysql_fetch_array($result)){
$id = $row['id'];
$date = $row['date'];
$question = $row['question'];
$time = date("U");
$likes = $row['likes'];
$query2 = "SELECT * FROM answers WHERE id = $id";
$num_rows = mysql_num_rows($query2);
print("<span style='font-size: .7em';><a href='qplusone.php?id=$id'>+1</a>
- Likes:$likes</span> $question - <a href='answer.php?id=$id&pp=$time'>answer it</a>
or <a href='answers.php?id=$id&pp=$time'>read $num_rows answers</a>
<span style='font-size: .7em';>($date)</span><br />");
}
?>
'SELECT COUNT(answers.id)FROM问题LEFT JOIN答案ON questions.id = answers.id WHERE questions.id = $ id' –