Question

我想计算重复项并将其输出为数字。

数据库：

user   
Sam
Sam    
Tom    
Tom    
Tom 
John

这是我的代码：

 $sql = "select user, count(*) duplicates from users group by user order by duplicates desc";
      $result = $conn->query($sql);

      if ($result->num_rows > 0) {
          // output data of each row
          while($row = $result->fetch_assoc()) {
              echo $row["user"]. "<br>";
          }
      } else {

      }

这行得通，但这是输出：

Tom
Sam
John

我希望输出仅是数字：

3
2
1

感谢您的回答。

Answer 1

您可以使用SQL进行计数（就像以前一样）并将数字存储在属性中。可以在PHP中直接读取此属性。您必须在SQL中使用AS声明计数变量。

$sql = "select user, count(*) AS duplicates from users group by user order by duplicates desc";
$result = $conn->query($sql);

if ($result->num_rows > 0) 
{
  // output data of each row
  while($row = $result->fetch_assoc()) 
  {
    echo $row["duplicates"]. "<br>";
  }
} 
else 
{
}

Answer 2

选择[mysqld] #Path to installation directory. All paths are usually resolved relative to this. basedir = "C:/Program Files (x86)/EasyPHP-Devserver-17/eds-binaries/dbserver/mysql5717x86x191205223118/" skip-grant-tables <=== added this line列，而不是选择user列：

ID

然后在您的$sql = "select ID, count(*) duplicates from users group by user order by duplicates desc";中输出ID列：

echo

PHP / mysql计算重复项并输出为数字

2 个答案: