Question

我想要完成的任务：

    Dataset 1
    Name1
    Name2
    Name3

    Dataset 2
    Number1
    Number2
    Number3

将成为2列：

dataset1   dataset2
Name1      Number1
Name2      Number2
Name3      Number3

我的数据集1＆amp; 2将始终具有相等的行。只要两个名字没有链接到同一个号码，哪个号码链接到我不关心的号码，反之亦然。

如何使用SQL / SQL Server解决此问题？

Answer 1

如果您不想向表中添加标识列，可以使用ROW_NUMBER（）函数，如下所示：

SELECT
    T1.Col1,
    T2.Col1
FROM
    (SELECT Col1, ROW_NUMBER() OVER (ORDER BY Col1) AS N FROM Table1) T1
INNER JOIN
    (SELECT Col1, ROW_NUMBER() OVER (ORDER BY Col1) AS N FROM Table2) T2
ON T1.N = T2.N

此处，将Table1和Table2替换为表的名称，并将Col1替换为要从这两个表中输出的列（或列）的名称。

Answer 2

向两个表添加标识列，并根据这些列执行连接

ALTER TABLE Table1
  ADD ID INT IDENTITY(1,1) NOT NULL


ALTER TABLE Table2
  ADD ID INT IDENTITY(1,1) NOT NULL


SELECT Table1.dataset1col , Table2.dataset2Col
From Table1 INNER JOIN Table2 
     ON Table1.ID = Table2.ID

Answer 3

这可能对您有用：

;WITH cte1 (name, rn)
     AS (SELECT Name,
                row_number()
                  OVER(
                    ORDER BY Name) rn
         FROM   Dataset1),
     cte2 (Number, rn)
     AS (SELECT Number,
                row_number()
                  OVER(
                    ORDER BY Number) rn
         FROM   Dataset2)
SELECT name,
       Number
FROM   cte1
       JOIN cte2
         ON cte1.rn = cte2.rn

Answer 4

WITH Table1 AS
(
  SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Dataset1) as Rnk,Dataset1
  FROM TA1
)

With Table2 AS
(
  SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Dataset2) as Rnk, Dataset2
  FROM TA2
)

Select Table.Dataset1 as 'DataSet1', Table2.DataSet2 as 'DataSet2'
From Table1 
inner join Table2 on Table1.Rnk = Table2.Rnk

因为你没有添加表名所以我认为它是TA1和TA2。

Answer 5

编写查询的另一种方法是：

select row_number() over (order by Names asc) as rownum,
       Names
into  #Temp1
from NameTable

select row_number() over (order by Numbers asc) as rownum,
       Numbers
into  #Temp2
from NumberTable

select Names, Numbers
from #Temp1
inner join #Temp2 on #Temp1.rownum = #Temp2.rownum

Demo

Answer 6

有三种可能的解决方案。

首先：使用以下技巧（警告：小数据集时使用此功能）

SELECT DISTINCT tbl1.col1, tbl2.col2
FROM
   (SELECT FirstName AS col1, ROW_NUMBER() OVER (ORDER BY FirstName) Number FROM dbo.User) tbl1
INNER JOIN
  (SELECT LastName AS col2, ROW_NUMBER() OVER (ORDER BY LastName) Number FROM dbo.User) tbl2 
ON tbl1.Number = tbl2.Number

第二：使用变量表临时存储结果。此解决方案适用于相对较大的数据集。（大约记录到100s）

<强>第三如mmhasannn所述，在两个表中使用identitfy字段。但我最不喜欢这种方法，因为我们需要修改我们的数据库结构。

推荐：使用变量表方法

TSQL合并2个数据集，其中偶数行彼此相邻

6 个答案: