Question

这些是我的表格：

Table_Bill_Summary

| Date | PersonId | BillNo |

Table_Bill_Items

| BillNo | ItemId | Quantity |

Item_MasterTable

| ItemId | ItemName | ItemRate |

我要指定一个PersonId。这就是我想要打印的内容：

SELECT *
FROM Table_Bill_Summary
WHERE PersonId=@X
    (SELECT IM.ItemName,BI.Quantity,IM.ItemRate
     FROM Table_Bill_Items AS BI
     INNER JOIN Item_MasterTable AS IM ON BI.ItemId=IM.ItemId
     WHERE BI.BillNo=??)

我的结果应如下：

23/04/2013      Person123       Bill32
    Item20  23  100
    Item21  20  200
    Item23  1   300
23/04/2013      Person123       Bill39
    Item2   2   100
    Item11  40  800
    Item43  1   700

我希望为Select列上的父Select查询检索的每一行运行子BillNo查询

Answer 1

    select FLD1,FLD2,FLD3 from
(
SELECT CAST(Date as varchar(10)) as FLD1  ,CAST(PersonId as varchar(10)) as FLD2,
cast(BillNo as varchar(10)) as FLD3,1 as FLD4, Billno as fld5
FROM Table_Bill_Summary WHERE  PersonId =@X

union

SELECT CAST(IM.ItemName as varchar(10)) as FLD1  ,CAST(BI.Quantity as varchar(10)) as FLD2,CAST(IM.ItemRate as varchar(10)) as FLD3 ,2 as FLD4, BS.Billno as fld5
FROM Table_Bill_Summary BS inner join Table_Bill_Items AS BI  on bs.BillNo=BI.BillNo
INNER JOIN Item_MasterTable AS IM  ON BI.ItemId=IM.ItemId
WHERE  Bs.PersonId =@X
) as x order by fld5,fld4

Answer 2

您无法在SQL中执行此操作。相反，通过获取按帐单排序的联接结果（帐单和项目）并在迭代结果集时跟踪上次查看的帐单来执行应用程序中的操作：

string stm = @"
  SELECT   BillNo, Date, ItemName, Quantity, ItemRate
  FROM     Table_Bill_Summary
      JOIN Table_Bill_Items USING (BillNo)
      JOIN Item_MasterTable USING (ItemId)
  WHERE    PersonId = @Person
  ORDER BY BillNo
";

MySqlCommand cmd = new MySqlCommand(stm, conn);
cmd.Prepare();
cmd.Parameters.AddWithValue("@Person", person_id);
MySQLDataReader rdr = cmd.ExecuteReader();

bool isMore = rdr.Read();
while (isMore) {
  int current_bill = rdr.GetInt32(0);
  // output bill
  do {
    // output item
  } while (isMore = rdr.Read() && rdr.GetInt32(0) == current_bill);
}

Answer 3

你做不到。（至少没有一些奇怪的技巧;-) SQL select语句总是会产生一个显示相同列的行列表。

您通常可以使用报告软件或其他编程语言和GUI来解决此问题。

父选择SQL查询生成子选择

3 个答案: