Question

我在将两个陈述放在一起时遇到了问题

我目前的代码：

include 'config.php'; 

$result22 = mysql_query("SELECT * FROM messages WHERE to_user='".$_SESSION['username']."'     AND to_read_yet='yes' ");


$num_rows22 = mysql_num_rows($result22);


echo "$num_rows22 ";

由于某种原因，这不起作用。我没有得到任何结果我检查了数据库，并且有结果应该出来

Answer 1

您应该阅读有关sql语法的内容。在你用bool运算符放置任何数字条件之后。使用2次where不正确

$result = mysql_query("SELECT * FROM messages WHERE to_user='".$_SESSION['username']."'     AND to_read_yet='"no"' ");

Answer 2

保留第二个WHERE表达式，它只是WHERE condition_1 AND condition_2 AND condition_3 AND ....

$result = mysql_query("SELECT * FROM messages WHERE to_user='".$_SESSION['username']."' AND to_read_yet='"no"' ");

Answer 3

SELECT *
FROM messages
WHERE to_user = '".$_SESSION['username']."'
  AND to_read_yet= '"no"'

Answer 4

尝试：

$result = mysql_query("SELECT * FROM messages WHERE to_user='".$_SESSION['username']."'     AND to_read_yet='no' ");

Answer 5

$result = mysql_query( "SELECT * FROM messages WHERE to_user='" . $_SESSION['username'] . "' AND to_read_yet='no'" );

删除第二个WHERE

将2个WHERE语句放在一起

5 个答案: