在 sql 中使用 join on 后删除重复的列

Question

我有以下 sql 查询，它在两列上连接两个 select 语句

SELECT * FROM 
(SELECT TOP(100)
    Name
    ,ItemNum
    ,TicketNum
    FROM [dbo].[dd]
    ) t1 
JOIN
(SELECT TOP (100)
  TicketNum
 ,ItemNum
FROM [dbo].[dd]) t2

ON t1.ItemNum = t2.ItemNum
AND t1.TicketNum = t2.TicketNum

查询产生以下输出。

但我希望输出是 |名称 | ItemNum |TicketNum |

Answer 1

解决方案一： 像这样指定列名

SELECT
    t1.Name, t1.ItemNum, t1.TicketNum
FROM (
    SELECT TOP 100
        Name, ItemNum, TicketNum
    FROM [dbo].[dd]
) t1 
INNER JOIN (
    SELECT TOP 100
        TicketNum, ItemNum
    FROM [dbo].[dd]
) t2 ON t1.ItemNum = t2.ItemNum
    AND t1.TicketNum = t2.TicketNum

方案二：

SELECT t1.* FROM (
    SELECT TOP 100
        Name, ItemNum, TicketNum
    FROM [dbo].[dd]
) t1 
INNER JOIN (
    SELECT TOP 100
        TicketNum, ItemNum
    FROM [dbo].[dd]
) t2 ON t1.ItemNum = t2.ItemNum
    AND t1.TicketNum = t2.TicketNum

在 sql 中使用 join on 后删除重复的列

Remove duplicate columns after using join on in sql

sql

sql-server

join

duplicates