左連接無結果

Question

這是兩個表。

tbl_Invoice

tbl_Payment

我要的是Pending Invoices由一個特定的客戶端。

現有查詢是如下：

Select * from tbl_Invoice I 
    left join tbl_payment P on I.client_id = P.client_id 
    left join tbl_client C on I.client_id = C.client_id 
    where I.invoice_Id not in (P.invoice_Id) 
    and I.client_id = 8 

但它給空白結果監守支付表是空白。

Answer 1

你需要從WHERE到ON移動條件：

Select * from tbl_Invoice I 
left join tbl_payment P on (I.client_id = P.client_id 
AND p.invoice_id <> I.invoice_Id) 
left join tbl_client C on I.client_id = C.client_id 

WHERE I.client_id = 5