SQL按日期分組但保留記錄

Question

我假設php/cakephp/sql保持原狀。 我有一個“ History表，其中包含創建的DATETIME.類型的列DATETIME. 我將顯示所有歷史記錄，但按天排列。

------------------------------------------
id   created                what
------------------------------------------
1    2014-01-01 08:00:00   Someone ran
2    2014-01-01 09:00:00   Someone cried
2    2014-01-02 10:00:00   Someone spoke
2    2014-01-02 18:00:00   Someone worked

而我尋找的結果

array(
'2014-01-01' => array(
                      0=>array('time'=>'8:00','what'=>'Someone ran'
                      1=>array('time'=>'9:00','what'=>'Someone cried'
                     ),
'2014-01-02' => array(
                      0=>array('time'=>'10:00','what'=>'Someone spoke',
                      1=>array('time'=>'18:00','what'=>'Someone worked',
                     )
)

我完全被困住了。 我應該調查哪個SQL語句？ GROUP不好...

Answer 1

如果其他審稿人同意，我將在cakephp中給出我的答案，改編自該SO答案

 $histories = $this->History->find('all',
                    array(
                        'group'=>array('History.created')
            ));


 foreach ($histories as $item) {
                $key = date('Y-m-d',strtotime($item['History']['created']));
                if (!isset($groups[$key])) {
                    $groups[$key] = array(
                        'items' => array($item),
                        'count' => 1,
                    );
                } else {
                    $groups[$key]['items'][] = $item;
                    $groups[$key]['count'] += 1;
                }
            }