Sql server 组合两个具有可变条目数的临时表_Sql Server

Sql server 组合两个具有可变条目数的临时表

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Sql server 组合两个具有可变条目数的临时表,sql-server,Sql Server,我有一个关于两个不同表的条目组合的问题，其中一个表的条目数可变，分别填充列我的输入数据： -- TABLE1 and TABLE2 are my input -- Here I defined 8 columns for TABLE1, but it can be more or less CREATE TABLE #t1( [ID] [int] identity(1,1), [IDBG1] [int] NULL, [BG1] nvarchar(max),

我有一个关于两个不同表的条目组合的问题，其中一个表的条目数可变，分别填充列

我的输入数据：

-- TABLE1 and TABLE2 are my input 
-- Here I defined 8 columns for TABLE1, but it can be more or less

CREATE TABLE #t1(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max)
    )

CREATE TABLE #t2(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max)
    )

-- TABLE3 is for my results 
-- number of columns is max. number of columns of TABLE 1 plus number of columns of TABLE2 
-- here: 8 Columns for TABLE1 entries and 4 columns for TABLE2 entries

CREATE TABLE #t3(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max),
    [IDBG5] [int] NULL,
    [BG5] nvarchar(max),
    [IDBG6] [int] NULL,
    [BG6] nvarchar(max)
    )

-- the IDBG entries are ID's and the BG's are the corresponding names
-- for example

INSERT INTO #t1 (IDBG1, BG1, IDBG2, BG2, IDBG3, BG3, IDBG4, BG4)
VALUES (102, 'BS', 302, 'SL', 345, 'AS', 75, 'LT')

INSERT INTO #t2 (IDBG1, BG1, IDBG2, BG2)
VALUES (900, 'SM', 789, 'CS')

SELECT * FROM #t1
SELECT * FROM #t2
SELECT * FROM #t3

我有一个包含可变条目数/列数的表1（我只知道最大列数），我有一个定义条目数的表2，我为我的结果创建了一个定义列数的表3（列数=合并前两个表时的最大列数）

我的任务是：

-- TABLE1 and TABLE2 are my input 
-- Here I defined 8 columns for TABLE1, but it can be more or less

CREATE TABLE #t1(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max)
    )

CREATE TABLE #t2(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max)
    )

-- TABLE3 is for my results 
-- number of columns is max. number of columns of TABLE 1 plus number of columns of TABLE2 
-- here: 8 Columns for TABLE1 entries and 4 columns for TABLE2 entries

CREATE TABLE #t3(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max),
    [IDBG5] [int] NULL,
    [BG5] nvarchar(max),
    [IDBG6] [int] NULL,
    [BG6] nvarchar(max)
    )

-- the IDBG entries are ID's and the BG's are the corresponding names
-- for example

INSERT INTO #t1 (IDBG1, BG1, IDBG2, BG2, IDBG3, BG3, IDBG4, BG4)
VALUES (102, 'BS', 302, 'SL', 345, 'AS', 75, 'LT')

INSERT INTO #t2 (IDBG1, BG1, IDBG2, BG2)
VALUES (900, 'SM', 789, 'CS')

SELECT * FROM #t1
SELECT * FROM #t2
SELECT * FROM #t3

我想从表1中获取一行中的所有条目，并将其与新表3中的一行中的四个条目合并。但同时我不知道table1有多少填充列。因此，我无法定义表3的哪些列应该插入表1的条目

示例数据：

-- TABLE1 and TABLE2 are my input 
-- Here I defined 8 columns for TABLE1, but it can be more or less

CREATE TABLE #t1(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max)
    )

CREATE TABLE #t2(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max)
    )

-- TABLE3 is for my results 
-- number of columns is max. number of columns of TABLE 1 plus number of columns of TABLE2 
-- here: 8 Columns for TABLE1 entries and 4 columns for TABLE2 entries

CREATE TABLE #t3(
    [ID] [int] identity(1,1),
    [IDBG1] [int] NULL,
    [BG1] nvarchar(max),
    [IDBG2] [int] NULL,
    [BG2] nvarchar(max),
    [IDBG3] [int] NULL,
    [BG3] nvarchar(max),
    [IDBG4] [int] NULL,
    [BG4] nvarchar(max),
    [IDBG5] [int] NULL,
    [BG5] nvarchar(max),
    [IDBG6] [int] NULL,
    [BG6] nvarchar(max)
    )

-- the IDBG entries are ID's and the BG's are the corresponding names
-- for example

INSERT INTO #t1 (IDBG1, BG1, IDBG2, BG2, IDBG3, BG3, IDBG4, BG4)
VALUES (102, 'BS', 302, 'SL', 345, 'AS', 75, 'LT')

INSERT INTO #t2 (IDBG1, BG1, IDBG2, BG2)
VALUES (900, 'SM', 789, 'CS')

SELECT * FROM #t1
SELECT * FROM #t2
SELECT * FROM #t3

可能吗？因为我只知道，应该填写的栏目必须事先指定

您要执行的操作称为交叉连接：

INSERT INTO #t1 (IDBG1, BG1, IDBG2, BG2, IDBG3, BG3, IDBG4, BG4)
VALUES (102, 'BS', 302, 'SL', 345, 'AS', 75, 'LT')
    , (103, 'BS', 302, 'SL', 345, 'AS', 75, 'LT')

INSERT INTO #t2 (IDBG1, BG1, IDBG2, BG2)
VALUES (900, 'SM', 789, 'CS')
    , (901, 'SM', 789, 'CS')

INSERT INTO #t3(IDBG1, BG1, IDBG2, BG2, IDBG3, BG3, IDBG4, BG4, IDBG5, BG5, IDBG6, BG6) 
SELECT t1.IDBG1, t1.BG1, t1.IDBG2, t1.BG2, t1.IDBG3, t1.BG3, t1.IDBG4, t1.BG4 
    , [IDBG5] = t2.IDBG1, [BG5] = t2.BG1, [IDBG6] = t2.IDBG2, [BG6] = t2.BG2
FROM #t1 t1 CROSS JOIN #t2 t2

SELECT * FROM #t1
SELECT * FROM #t2
SELECT * FROM #t3

输出：

ID  IDBG1   BG1 IDBG2   BG2 IDBG3   BG3 IDBG4   BG4 IDBG5   BG5 IDBG6   BG6
1   102     BS  302     SL  345     AS  75      LT  900     SM  789     CS
2   103     BS  302     SL  345     AS  75      LT  900     SM  789     CS
3   102     BS  302     SL  345     AS  75      LT  901     SM  789     CS
4   103     BS  302     SL  345     AS  75      LT  901     SM  789     CS

见：

在Technet上
堆栈上溢出

现在，如果您不知道t1中是什么，那么需要编写一些动态SQL

此查询获取：

@col_select中的t1列（ID除外）
@col#u select中#t2（ID除外）的前4列
@col_insert中#t3（ID除外）的前N列，N=t1+4的计数（对于t2）

查询：

declare @t1_id bigint = OBJECT_ID('tempdb.dbo.#t1');
declare @t2_id bigint = OBJECT_ID('tempdb.dbo.#t2');
declare @t3_id bigint = OBJECT_ID('tempdb.dbo.#t3');
declare @col_select nvarchar(max),  @col_insert nvarchar(max), @sql nvarchar(max);

-- Get #t1 columns
Set @col_select = STUFF((
        SELECT ', ' + 't1.' + QUOTENAME(name) 
        FROM  tempdb.sys.columns 
        WHERE OBJECT_ID = @t1_id AND name not like 'ID'
        ORDER BY column_id
        FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
,1,1,'');

-- Add first 4 columns from #t2
Set @col_select = @col_select + ',' + STUFF((
        SELECT TOP(4) ', ' + 't2.' + QUOTENAME(name) 
        FROM  tempdb.sys.columns 
        WHERE OBJECT_ID = @t2_id AND name not like 'ID'
        ORDER BY column_id
        FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
,1,1,'');

-- Get first n columns from #t3 (n = t1 count + 4)
Set @col_insert = STUFF((
        SELECT TOP(SELECT COUNT(*)-1+4 FROM  tempdb.sys.columns WHERE OBJECT_ID = @t1_id) ', ' + QUOTENAME(name) 
        FROM  tempdb.sys.columns 
        WHERE OBJECT_ID = @t3_id AND name not like 'ID'
        ORDER BY column_id
        FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
,1,1,'');

SET @sql = '
    INSERT INTO #t3(' + @col_insert + ') 
    SELECT ' + @col_select + '
    FROM #t1 t1 CROSS JOIN #t2 t2
';

EXEC sp_executesql @sql;

通过您的示例，它可以得到：

@列select=t1.[IDBG1]，t1.[IDBG1]，t1.[IDBG2]，t1.[IDBG3]，t1.[IDBG3]，t1.[IDBG4]，t1.[BG4]，t2.[IDBG1]，t2.[IDBG2]，t2.[BG2]
@列select=t1[IDBG1]，t1[BG1]，t1[IDBG2]，t1[BG2]，t1[IDBG3]，t1[BG3]，t1[IDBG4]，t1[BG4]
@列插入=[IDBG1]、[BG1]、[IDBG2]、[IDBG3]、[IDBG4]、[BG4]、[IDBG5]、[BG5]、[IDBG6]、[BG6]

添加示例表数据和预期结果。听起来视图更适合我添加了一些示例数据。希望你现在能更好地理解。t1和t2之间没有关系吗？你只想让t2列在t1列的右边？如果表中有几行，预计会发生什么？更糟糕的是，行数不同？不，没有关系。我想将表1中的所有行与表2中的所有行合并，以便最终得到[（表1中的行数）乘以（表2中的行数）]不同的解决方案。