加入两个表中的SQL

Question

我正在寻找一个解决方案，以从表Table 1和Table结果。请参阅下面的图像的详细信息

Table1.OrderID = Table2.OrderID

我不是寻找一个简单的连接查询。在输出Table1中值不重复。

Answer 1

，最后我得到了什么，我正好在寻找

的解决方案

WITH MasterTable as (SELECT ROW_NUMBER() OVER(PARTITION BY OrderID ORDER BY OrderID ASC) AS SlNo,* FROM Table1), 
DetailTable as (SELECT ROW_NUMBER() OVER(PARTITION BY OrderID ORDER BY OrderID ASC) AS SlNo,* FROM Table2) 

SELECT * FROM MasterTable A FULL JOIN DetailTable B 
ON A.OrderID = B.OrderID AND A.SlNo=B.SlNo 
ORDER BY B.OrderID 

Answer 2

select Table1.*, Table2.Items, Table2.Quantity -- List the columns you want. I've specified the table name to avoid ambiguous column errors, and * means all columns 
from Table1 
inner join Table2 -- This is a join (inner gets only the records that exist in both tables) 
on Table1.OrderID = Table2.OrderID -- This is the join condition, you define which columns are the same between the tables 

而对于空白位，因为你缺乏的意识在显示层来处理这个：

with CTE as 
(
select Table1.*, 
     Table2.Items, 
     Table2.Quantity, 
     row_number() over(partition by Table1.OrderID order by Items) as rn 
    from Table1 
    inner join Table2 
    on Table1.OrderID = Table2.OrderID 
) 

select case when rn = 1 then OrderID end as OrderID, 
     case when rn = 1 then CustomerName end as CustomerName , 
     case when rn = 1 then CTE.Desc end as Desc, 
     Items, 
     Quantity 
from CTE 

Answer 3

您可以通过使用ROW_NUMBER（）OVER（PARTITION BY ORDER BY）实现这一结果 代码：

select 
    CASE WHEN ROW_NUMBER() OVER(PARTITION BY tb1.orderid ORDER BY tb1.orderid) = 1 THEN tb1.orderid ELSE null END AS orderid, 
    CASE WHEN ROW_NUMBER() OVER(PARTITION BY tb1.custname ORDER BY tb1.orderid) = 1 THEN tb1.custname ELSE '' END AS custname, 
    CASE WHEN ROW_NUMBER() OVER(PARTITION BY tb1.Descp ORDER BY tb1.orderid) = 1 THEN tb1.Descp ELSE '' END AS Descp, 
    tb2.item,tb2.quentity 
    from tb1 inner join tb2 on tb1.orderid=tb2.orderid 

输出：

orderid custname Descp item quentity 
    1 Ccustomer1 1item Pen  1 
    2 Ccustomer2 2item Ball 2 
          Bat 1 
    3 Ccustomer3 3item Book 2 
          Box  1 
          Bag  1 
          Pen  2