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我正在使用winforms.NET 3.5 并sql server 2005使用 c#。

我需要加入 3 个表，例如Advance_cost，room_no_info并bill使用内部联接... 

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

表中的advance_cost数据可能为空或没有日期的数据bill.date。所以连接中的第三个条件为假所以它不显示一些数据但是Advance_cost.total_amount=0当第三个表值变空时我需要

有什么想法吗？

4

2 回答 2

2

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
于 2013-06-27T07:36:44.420 回答
1 
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
于 2013-06-27T07:40:40.923 回答