复杂SQL代码

Question

我遇到了与多个不同表对应的SQL查询问题。我已经写了下面的代码，但它似乎将每个预订与每张发票结合起来，而不是找到与特定预订匹配的特定发票。任何帮助将不胜感激。

$sql = "SELECT INVOICE.invoice_id, 
      g.guest_first_name, 
      g.guest_last_name, 
      g.booking_num_guests, 
      g.booking_num_nights, 
      CURRENCY.currency_name, 
      INVOICE.invoice_nightly_rate,  
      INVOICE.invoice_deposit_amount, 
      INVOICE.invoice_paid, 
      ACCOUNT.account_name 
     FROM INVOICE  
     INNER JOIN BOOKING 
      ON INVOICE.invoice_booking_id = BOOKING.booking_id 
     INNER JOIN CURRENCY 
      ON INVOICE.invoice_currency_id = CURRENCY.currency_id 
     INNER JOIN ACCOUNT 
      ON INVOICE.invoice_account_id = ACCOUNT.account_id 
     INNER JOIN (
      SELECT GUEST.guest_first_name, 
        GUEST.guest_last_name, 
        BOOKING.booking_num_guests, 
        BOOKING.booking_num_nights 
      FROM BOOKING 
      INNER JOIN GUEST 
       ON BOOKING.booking_guest_id = GUEST.guest_id) g 
       ON INVOICE.invoice_booking_id = BOOKING.booking_id"; 

Answer 1

既然你已经在第一内加入INVOICE和BOOKING表连接，最后的内部连接应该是BOOKING和GUEST表之间。将您的查询改为

$sql = "SELECT 
      INVOICE.invoice_id, 
      GUEST.guest_first_name, 
      GUEST.guest_last_name, 
      BOOKING.booking_num_guests, 
      BOOKING.booking_num_nights, 
      CURRENCY.currency_name, 
      INVOICE.invoice_nightly_rate, 
      INVOICE.invoice_deposit_amount, 
      INVOICE.invoice_paid, 
      ACCOUNT.account_name 
     FROM INVOICE  
     INNER JOIN BOOKING 
      ON INVOICE.invoice_booking_id = BOOKING.booking_id 
     INNER JOIN CURRENCY 
      ON INVOICE.invoice_currency_id = CURRENCY.currency_id 
     INNER JOIN ACCOUNT 
      ON INVOICE.invoice_account_id = ACCOUNT.account_id 
     INNER JOIN GUEST 
      ON BOOKING.booking_guest_id = GUEST.guest_id";