更新笨的表＃2基于表＃1的ID数据

Question

我有2个表，预订是客户

table #1 : reservation 
------------------------ 
- reservation_id 
- reservation_status 
- customer_id 

table #2 : customer 
------------------------ 
- customer_id 
- customer_name 
- customer_status 

我在笨新的，但我怎么可以更新/更改customer status（从0到1或1到某个值）基于reservation id

是否存在使用连接和更新或有些情况。 感谢

Answer 1

尝试此查询：

$sql = 'UPDATE customer AS C JOIN reservation AS R ON R.customer_id=C.customer_id 
SET C.customer_status = (CASE C.customer_status WHEN 1 THEN 0 ELSE 1 END) 
WHERE R.reservation_id="2"'; 
$result = $this->db->query($sql); 
if($result) { 
    echo "Success"; 
} else { 
    echo "fail"; 
} 

而且通过检查查询：

echo $this->db->last_query(); 

Answer 2

试试这个代码

UPDATE customer 
     JOIN reservation 
     ON customer.customer_id = reservation.customer_id 
SET  customer.customer_status = your_value; 
WHERE reservation.reservation_id="your_id"';