SQL在主表中每个记录的详细信息表中添加空行-修改后的解决方案

Question

我需要将空行添加到SQL SELECT语句中，结果应为10的倍数，这意味着如果表中有8行，则应添加2空行，以便select语句有10行，如果表中有16行，应添加4空行，以便select语句有20行，依此类推。总之，选择的行必须始终为10、20、30、40等，以此类推

同时，它必须在主数据/明细业务情景中工作，如下所示：假定主表中有两个记录，如下所示：

MasterID
1
2

并在详细信息表中假定以下记录：

ID  MasterID    DetailsDescription
1      1        XXXXX
2      1        XXXXX
3      1        XXXXX
4      1        XXXXX
5      1        XXXXX
6      1        XXXXX
7      2        XXXX
8      2        XXXX
9      2        XXXX
10     2        XXXX
11     2        XXXX
12     2        XXXX
13     2        XXXX
14     2        XXXX

我希望结果是：

ID  MasterID    DetailsDescription
1      1        XXXXX
2      1        XXXXX
3      1        XXXXX
4      1        XXXXX
5      1        XXXXX
6      1        XXXXX
       1        NULL
       1        NULL
       1        NULL
       1        NULL
7      2        XXXX
8      2        XXXX
9      2        XXXX
10     2        XXXX
11     2        XXXX
12     2        XXXX
13     2        XXXX
14     2        XXXX
       2        NULL
       2        NULL

这样，对于主记录1，必须在明细表中选择10条记录（即，添加4空行，因为在明细表中只有6条记录链接到主记录1），对于主记录2同样是10行应该在明细表中选择（即添加了2空行，因为在明细表中有8行链接到主记录2），等等，等等。

然后我得到了一个很好的答案，除了大数据非常慢之外

DECLARE @MasterTable TABLE(MasterID INT)
INSERT INTO @MasterTable
VALUES(1),(2)

DECLARE @DetailsTable TABLE (ID INT, MasterID INT, _Text NVARCHAR(255)) 
DECLARE @X INT=1
WHILE @X <7 
BEGIN  
    INSERT INTO @DetailsTable VALUES (@X,1, 'XXXXX') 
    SET @X+=1 
END 

SET @X=1
WHILE @X <9 
BEGIN  
    INSERT INTO @DetailsTable VALUES (@X, 2, 'XXXXX') 
    SET @X+=1 
END 

DECLARE @TEMP TABLE (M_ID INT)
DECLARE @ID INT
INSERT @TEMP SELECT DISTINCT MasterID FROM @MASTERTABLE
WHILE ((SELECT COUNT(1) FROM @TEMP) > 0)
BEGIN
    SET @ID = (SELECT TOP 1 M_ID FROM @TEMP)
    INSERT @DETAILSTABLE  
     SELECT TOP (10 - ISNULL(NULLIF((SELECT COUNT(*) FROM  @DETAILSTABLE WHERE MASTERID = @ID) % 10, 0), 10))     
    (SELECT MAX(ID) FROM @DETAILSTABLE WHERE MasterID = @ID)+n, @ID, NULL     
    FROM (VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9),(10)) A(n)
    DELETE @TEMP WHERE M_ID = @ID
END

SELECT * FROM @DETAILSTABLE ORDER BY MasterID, ID

有人告诉我解决方案不是使用WHILE语句，而是使用CTE。 这是我的堆栈。

请修改答案，以便它使用CTE或其他快速选项，而不是我现在使用的选项。

Answer 1

这有点困难，因为您必须进行一些数学和怪诞的事情才能确定每个组需要多少行。 在显示代码之前，我需要向您展示如何在我的系统上保存理货单。 我使用不需要读取的视图。 这是超级疯狂的快。

create View [dbo].[cteTally] as

WITH
    E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)),
    E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
    E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
    cteTally(N) AS 
    (
        SELECT  ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
    )
select N from cteTally
GO

现在我们有了视图，我们需要一个包含一些示例数据的表。 我修改了样本，以便更清楚地了解每一行。

declare @Something table
(
    ID int
    , MasterID int
    , DetailsDescription varchar(10)
)

insert @Something values
(1, 1, 'X1')
, (2, 1, 'X2')
, (3, 1, 'X3')
, (4, 1, 'X4')
, (5, 1, 'X5')
, (6, 1, 'X6')
, (7, 2, 'Y1')
, (8, 2, 'Y2')
, (9, 2, 'Y3')
, (10, 2, 'Y4')
, (11, 2, 'Y5')
, (12, 2, 'Y6')
, (13, 2, 'Y7')
, (14, 2, 'Y8')
, (15, 2, 'Y9')
, (16, 2, 'Y10')
, (17, 2, 'Y11')
, (18, 2, 'Y12')
;

最后但并非最不重要的是用于生成所需输出的代码。 我将其分为三个CTE，以演示为此所需的步骤。 如果需要，您可以简化一下。 我在代码中包含了一些相关的注释，这些注释应解释其工作原理。

with GroupNumbers as
(
    select MasterID
        , floor((count(*) + 9) / 10) * 10 as Row_Count --this is how we calculate the number of rows for the group.
    from @Something s
    group by MasterID
)
, BaseRows as --this gets the number of rows for each group
(
    select *
    from GroupNumbers gn
    join cteTally t on t.N <= gn.Row_Count
)
, NumberedRows as --using this in case there are gaps in ID so the numbering is consistent
(
    select *
        , RowNum = ROW_NUMBER() over(partition by MasterID order by ID)
    from @Something
)

select *
from BaseRows br
left join NumberedRows nr on nr.MasterID = br.MasterID and nr.RowNum = br.N
order by br.MasterID
    , br.N

Answer 2

肖恩答案有效。 但是，当我尝试从VB内部将其作为脚本运行时，我得到： 关键字'declare'附近的语法不正确。 。 这是脚本：

    Dim MyAdapter As New System.Data.SqlClient.SqlDataAdapter
    Dim str As String = 
    "   create View [dbo].[cteTally] as " & _
    "       " & _
    "   WITH    " & _
    "       E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)), " & _
    "       E2(N) AS (SELECT 1 FROM E1 a, E1 b),    " & _
    "       E4(N) AS (SELECT 1 FROM E2 a, E2 b),    " & _
    "       cteTally(N) AS  " & _
    "       (   " & _
    "           SELECT  ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4  " & _
    "       )   " & _
    "   select N from cteTally  " & _
    "   GO  " & _
    "       " & _
    "   declare @Something table    " & _
    "   (   " & _
    "       ID int  " & _
    "       , MasterID int  " & _
    "       , DetailsDescription varchar(10)    " & _
    "   )   " & _
    "       " & _
    "   insert @Something values    " & _
    "   (1, 1, 'X1')    " & _
    "   , (2, 1, 'X2')  " & _
    "   , (3, 1, 'X3')  " & _
    "   , (4, 1, 'X4')  " & _
    "   , (5, 1, 'X5')  " & _
    "   , (6, 1, 'X6')  " & _
    "   , (7, 2, 'Y1')  " & _
    "   , (8, 2, 'Y2')  " & _
    "   , (9, 2, 'Y3')  " & _
    "   , (10, 2, 'Y4') " & _
    "   , (11, 2, 'Y5') " & _
    "   , (12, 2, 'Y6') " & _
    "   , (13, 2, 'Y7') " & _
    "   , (14, 2, 'Y8') " & _
    "   , (15, 2, 'Y9') " & _
    "   , (16, 2, 'Y10')    " & _
    "   , (17, 2, 'Y11')    " & _
    "   , (18, 2, 'Y12')    " & _
    "   ;   " & _
    "       " & _
    "   with GroupNumbers as    " & _
    "   (   " & _
    "       select MasterID " & _
    "           , floor((count(*) + 9) / 10) * 10 as Row_Count  " & _
    "       from @Something s   " & _
    "       group by MasterID   " & _
    "   )   " & _
    "   , BaseRows as   " & _
    "   (   " & _
    "       select *    " & _
    "       from GroupNumbers gn    " & _
    "       join cteTally t on t.N <= gn.Row_Count  " & _
    "   )   " & _
    "   , NumberedRows as   " & _
    "   (   " & _
    "       select *    " & _
    "           , RowNum = ROW_NUMBER() over(partition by MasterID order by ID) " & _
    "       from @Something " & _
    "   )   " & _
    "       " & _
    "   select *    " & _
    "   from BaseRows br    " & _
    "   left join NumberedRows nr on nr.MasterID = br.MasterID and nr.RowNum = br.N " & _
    "   order by br.MasterID    " & _
    "       , br.N  " & _
    "       " & _
    "       "


    Dim command As SqlCommand = New SqlCommand(str, myConnectionString)
    command.CommandText = str

    command.CommandTimeout = 0
    MyAdapter.SelectCommand = command

    Dim MyDataSet = New DataSet
    MyAdapter.Fill(MyDataSet, "Report")