Sql 如何在选择中创建while循环？

我有两个专栏

我想输出如下查询

我尝试在SQL中使用循环，但未能输出查询

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我的问题是：如何按[Total]列中的数字重复[Name]列中的值？

这通常通过递归子查询处理。但是，在名称重复的情况下，我导出了一个行顺序，最好使用唯一键

MS SQL Server 2017架构设置：

问题1：

:

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你可以做得比公认的答案简单得多

我建议创建一个带有顺序正整数的数字表

CREATE TABLE dbo.Numbers(Number INT PRIMARY KEY);

INSERT INTO dbo.Numbers
SELECT TOP 10000 ROW_NUMBER() OVER (ORDER BY @@SPID)
FROM sys.all_objects o1, 
     sys.all_objects o2

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然后在数字上加入你的封闭式问题

CREATE TABLE #Test1(
    [ID] [int] NULL,
    [Cnt] [varchar](50) NULL
) ON [PRIMARY]
GO


CREATE TABLE #Test2(
    [ID] [int] NULL,
    [col1] [varchar](50) NULL,
    [col2] [varchar](50) NULL,
    [col3] [varchar](50) NULL
) ON [PRIMARY]
GO

CREATE TABLE #Test3(
    [ID1] [int] NULL,
    Cnt int,
    Id2 int,
    [col1] [varchar](50) NULL,
    [col2] [varchar](50) NULL,
    [col3] [varchar](50) NULL
) ON [PRIMARY]
GO


INSERT INTO #TEST1 (ID, Cnt) VALUES (1, 2)
INSERT INTO #TEST1 (ID, Cnt) VALUES (2, 3)
INSERT INTO #TEST1 (ID, Cnt) VALUES (3, 1)
INSERT INTO #TEST1 (ID, Cnt) VALUES (4, 2)
INSERT INTO #TEST1 (ID, Cnt) VALUES (5, 1)
INSERT INTO #TEST1 (ID, Cnt) VALUES (6, 4)


INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (1, 'a1', 'b1', 'c1')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (2, 'a2', 'b2', 'c2')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (3, 'a3', 'b3', 'c3')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (4, 'a4', 'b4', 'c4')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (5, 'a5', 'b5', 'c5')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (6, 'a6', 'b6', 'c6')

declare @a int = 1, @b int, @c int = 0;
while @a <= (select MAX(Id) from #Test1)
begin
    set @b = (select Cnt from #Test1 where ID = @a);
    set @c = 0;
    while @c < @b begin
        insert into #Test3 (ID1, Cnt, Id2, col1, col2, col3) select @a, @b, @a, col1, col2, col3 from #Test2 where ID = @a;

        set @c += 1;
    end
    
    SET @a += 1;
end

select * from #Test3 order by 1, 2;

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如果您发布代码或错误消息的图像，请确保您也将实际的代码/消息复制粘贴或直接键入到帖子中-请注意，您不能在普通SQL中使用循环。这在过程SQL中可用。您需要的可以通过使用递归查询和一些计算来实现。ok how？？？……您是如何获得初始sql结果的？显示累计totalok的表我需要我想根据[total]Msg 208列16级状态1中的现有数字多次执行该语句，第1行对象名称“STRING_SPLIT”无效。我们的许多生产系统都是SQL 2016之前的。不过，这确实会减少查询的冗长程度。@MahmoudMagdyMousaa-将添加数字表示例的代码，然后语句终止。最大递归100在语句完成之前已用尽。最大100行>>>>>>>>>>>在查询后添加选项MAXRECURSION 0。有32767个递归帧的限制。

|    name | instance | total | OriginalTotal | running_total |
|---------|----------|-------|---------------|---------------|
|   ahmed |        1 |     1 |             3 |             1 |
|   ahmed |        1 |     1 |             3 |             2 |
|   ahmed |        1 |     1 |             3 |             3 |
| mahmoud |        2 |     1 |             2 |             1 |
| mahmoud |        2 |     1 |             2 |             2 |
|   ahmed |        3 |     1 |             5 |             1 |
|   ahmed |        3 |     1 |             5 |             2 |
|   ahmed |        3 |     1 |             5 |             3 |
|   ahmed |        3 |     1 |             5 |             4 |
|   ahmed |        3 |     1 |             5 |             5 |

CREATE TABLE dbo.Numbers(Number INT PRIMARY KEY);

INSERT INTO dbo.Numbers
SELECT TOP 10000 ROW_NUMBER() OVER (ORDER BY @@SPID)
FROM sys.all_objects o1, 
     sys.all_objects o2

SELECT name, 1 AS total
FROM Names nam 
JOIN dbo.Numbers num ON num.Number <= nam.total;

SELECT name, 1 AS total
FROM Names
CROSS APPLY STRING_SPLIT(SPACE(total - 1), ' ')

CREATE TABLE #Test1(
    [ID] [int] NULL,
    [Cnt] [varchar](50) NULL
) ON [PRIMARY]
GO


CREATE TABLE #Test2(
    [ID] [int] NULL,
    [col1] [varchar](50) NULL,
    [col2] [varchar](50) NULL,
    [col3] [varchar](50) NULL
) ON [PRIMARY]
GO

CREATE TABLE #Test3(
    [ID1] [int] NULL,
    Cnt int,
    Id2 int,
    [col1] [varchar](50) NULL,
    [col2] [varchar](50) NULL,
    [col3] [varchar](50) NULL
) ON [PRIMARY]
GO


INSERT INTO #TEST1 (ID, Cnt) VALUES (1, 2)
INSERT INTO #TEST1 (ID, Cnt) VALUES (2, 3)
INSERT INTO #TEST1 (ID, Cnt) VALUES (3, 1)
INSERT INTO #TEST1 (ID, Cnt) VALUES (4, 2)
INSERT INTO #TEST1 (ID, Cnt) VALUES (5, 1)
INSERT INTO #TEST1 (ID, Cnt) VALUES (6, 4)


INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (1, 'a1', 'b1', 'c1')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (2, 'a2', 'b2', 'c2')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (3, 'a3', 'b3', 'c3')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (4, 'a4', 'b4', 'c4')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (5, 'a5', 'b5', 'c5')
INSERT INTO #TEST2 (ID, Col1, Col2, Col3) VALUES (6, 'a6', 'b6', 'c6')

declare @a int = 1, @b int, @c int = 0;
while @a <= (select MAX(Id) from #Test1)
begin
    set @b = (select Cnt from #Test1 where ID = @a);
    set @c = 0;
    while @c < @b begin
        insert into #Test3 (ID1, Cnt, Id2, col1, col2, col3) select @a, @b, @a, col1, col2, col3 from #Test2 where ID = @a;

        set @c += 1;
    end
    
    SET @a += 1;
end

select * from #Test3 order by 1, 2;