PHP MySQL的组由两列

Question

我有这个表在MySQL中进行选择：

我想通过浏览器和版本组选择的结果。

通缉输出：

Array 
(
    [firefox 3.0] => 2 
    [chrome 24.0] => 1 
    [ie 9.0] => 2 
    [ie 10.0] => 1 
) 

问题：如何组中选择得到想要的输出？

注：表可以包含多个版本的浏览器，那么阵列将扩大。

我尝试：

PHP：

public function get_browsers() { 
    $query = " 
     SELECT browser, COUNT(browser) AS num 
     FROM table 
     GROUP BY browser 
     ORDER BY browser ASC 
     "; 
    $select = mysqli_query($this->c, $query); 
    while ($row = mysqli_fetch_array($select)) { 
     $data[$row['browser']] = (int) $row['num']; 
    } 
    return $data; 
} 

电流输出：

Array 
(
    [firefox] => 2 
    [chrome] => 1 
    [ie] => 3 
) 

Answer 1

public function get_browsers() { 
    $query = ' 
     SELECT browser, version, COUNT(*) AS num 
     FROM  table 
     GROUP BY browser, version 
    '; 
    $select = mysqli_query($this->c, $query); 
    while ($row = mysqli_fetch_array($select)) { 
     $data[$row['browser'].' '.$row['version']] = (int) $row['num']; 
    } 
    return $data; 
} 

Answer 2

SELECT concat(browser," ", version) as browser, COUNT(browser) AS num 
     FROM table 
     GROUP BY browser, version 
     ORDER BY browser ASC 

诀窍是添加version作为组准则;）

Answer 3

SELECT browser, CONCAT('browser', 'version') as bv COUNT(browser) AS num 
     FROM table 
     GROUP BY bv 
     ORDER BY browser ASC 
     ";