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如何離開joing?LEFT JOIN(mysql)
左表
SELECT TYPE , days
FROM leavetypes
type days
anual 10
casual 6
sick 10
右表
SELECT sub_leave_type, (
SUM(working_days)
) AS used
FROM vacations
WHERE `user_id` = '1'
AND `from_date`
BETWEEN '2012-01-01'
AND '2012-12-31'
GROUP BY sub_leave_type
sub_leave_type used
anual 3
casual 6
其實我這樣做對CakePHP的,這是我的代碼。
$allleaves = $this->Leavetype->find('all', array(
'joins' => array(
array(
'table' => 'vacations',
'alias' => 'vacationsJoin',
'type' => 'left',
'conditions' => array('vacationsJoin.sub_leave_type = Leavetype.type')
)
),
'conditions' => array(
'vacationsJoin.user_id' => $_SESSION['Auth']['User']['id'],
'vacationsJoin.from_date BETWEEN ? and ?' => array(date('Y') . '-01-01',
date('Y') . '-12-31')
),
'fields' => array('type', 'days', '(SUM(working_days)) as used'),
'group' => 'sub_leave_type',
));
$this->set(compact('allleaves'));
這不是出了什麼我想要的,我想要的是左表的所有行和其他人休假表
你究竟需要什麼?你如何加入這些表格?你嘗試了什麼,什麼不起作用?在MySQL中,LEFT JOIN和其他大多數SQL語言一樣,你可以像你習慣的那樣編寫它,它應該可以工作。 – 2012-03-05 10:03:12
你也可以回答你自己的問題。 – 2012-03-05 14:12:57