PHP组mysql由两列选择

Question

我在MySQL中有此表：

我想按浏览器和版本对选择结果进行分组。

想要的输出：

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

问题：如何分组选择以获得所需的输出？

注意：表可以包含更多版本的浏览器，因此数组将扩展。

我的尝试：

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

诀窍是将version添加为组条件；）

Answer 3

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