在SQL server中使用内部联接联接3个表

本文关键字：内部 3个表 SQL server | 更新日期: 2023-09-27 18:20:01

我正在使用c#处理.NET 3.5中的winforms和sql server 2005。

我需要使用内部联接来联接3个表，如Advance_cost、room_no_info和bill。。。

SELECT
      bill.bill_no AS BillNo
    , COUNT(room_no_info.room_number) AS TotalRoom
    , CONVERT(VARCHAR(11), room_no_info.in_date, 106) AS InDate
    , CONVERT(VARCHAR(11), room_no_info.out_date, 106) AS OutDate
    , bill.total AS Amount
    , Advance_cost.total_amount AS Advance
    , Advance_cost.total_amount AS Paid
    , bill.Balance AS Balance
FROM room_no_info
INNER JOIN bill ON bill.bill_no = room_no_info.bill_no
INNER JOIN Advance_cost ON bill.bill_no = Advance_cost.room_bill_no 
     AND bill.Date = '26-Jun-13'
GROUP BY
      bill.bill_no
    , room_no_info.in_date
    , room_no_info.out_date
    , bill.total
    , Advance_cost.total_amount
    , bill.Balance

在CCD_ 6中，表数据对于CCD_。所以join中的第三个条件为false，所以它不会显示一些数据，但当第三个表值为空时，我需要Advance_cost.total_amount=0

有什么想法吗？

在SQL server中使用内部联接联接3个表

尝试使用LEFT JOIN和ISNULL

SELECT
      bill.bill_no AS BillNo
    , COUNT(room_no_info.room_number) AS TotalRoom
    , CONVERT(VARCHAR(11), room_no_info.in_date, 106) AS InDate
    , CONVERT(VARCHAR(11), room_no_info.out_date, 106) AS OutDate
    , bill.total AS Amount
    , ISNULL(Advance_cost.total_amount, 0) AS Advance
    , ISNULL(Advance_cost.total_amount, 0) AS Paid
    , bill.Balance AS Balance
FROM room_no_info
INNER JOIN bill ON bill.bill_no = room_no_info.bill_no
LEFT JOIN Advance_cost ON bill.bill_no = Advance_cost.room_bill_no 
     AND bill.Date = '26-Jun-13'
GROUP BY
      bill.bill_no
    , room_no_info.in_date
    , room_no_info.out_date
    , bill.total
    , Advance_cost.total_amount
    , bill.Balance

SELECT
      bill.bill_no AS BillNo
    , COUNT(room_no_info.room_number) AS TotalRoom
    , CONVERT(VARCHAR(11), room_no_info.in_date, 106) AS InDate
    , CONVERT(VARCHAR(11), room_no_info.out_date, 106) AS OutDate
    , bill.total AS Amount
    , ISNULL(Advance_cost.total_amount, 0) AS Advance
    , ISNULL(Advance_cost.total_amount, 0) AS Paid
    , bill.Balance AS Balance
FROM room_no_info
INNER JOIN bill ON bill.bill_no = room_no_info.bill_no
LEFT OUTER JOIN Advance_cost ON bill.bill_no = Advance_cost.room_bill_no 
     AND bill.Date = '26-Jun-13'
GROUP BY
      bill.bill_no
    , room_no_info.in_date
    , room_no_info.out_date
    , bill.total
    , Advance_cost.total_amount
    , bill.Balance
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