請幫我理解正確的連接語法。concat in php codeigniter
我有一個名爲表庫存其中有:
trans_id
trans_items items -> item_id
trans_user employees -> person_id
trans_date
trans_comment
trans_inventory
正如你可以在上面看到,trans_items是在項目表的外鍵,並且trans_user是員工表的外鍵和員工ID是國外關鍵人桌。
現在我想要做的是在HTML中顯示庫存表,但不是顯示員工ID,我希望顯示員工姓名。
編輯.......................................... ...... ,所以我能夠以僅顯示與此代碼僱員的名字:
$this->db->select('inventory.*, items.name ,people.last_name');
$this->db->from('inventory');
$this->db->join('items', 'inventory.trans_items = items.item_id' , 'left');
$this->db->join('people', 'inventory.trans_user = people.person_id' , 'left');
$this->db->where('deleted', 0);
$this->db->order_by('trans_date desc');
與模型代碼:
foreach($report_data as $row)
{
$tabular_data[] = array($row['name'], $row['last_name'],$row['trans_date'], $row['trans_inventory'], $row['trans_comment']);
}
,但我需要它是第一姓名,所以我做了這些:
$this->db->select('inventory.*, items.name ,CONCAT(people.first_name, " ",people.last_name) as employee');
$this->db->from('inventory');
$this->db->join('items', 'inventory.trans_items = items.item_id' , 'left');
$this->db->join('people', 'inventory.trans_user = people.person_id' , 'left');
$this->db->where('deleted', 0);
$this->db->order_by('trans_date desc');
與模型代碼:
foreach($report_data as $row)
{
$tabular_data[] = array($row['name'], $row['employee'],$row['trans_date'], $row['trans_inventory'], $row['trans_comment']);
}
將錯誤,如果我會用concat函數。請幫忙。
@AntonioCS:在回答你的標誌,則`mysql`標籤被添加到標題爲搜索引擎優化的目的。請參閱[關鍵字的順序是否與頁面標題有關?](http://webmasters.stackexchange.com/questions/6556/does-the-order-of-keywords-matter-in-a-page-標題)和[爲什麼第一個標籤有時在