SQL Server 2008查询1行日期转换为列

Question

我的查询是

SELECT 
   UB.UnitID as UnitID, UB.Name as Unit, US.UnitID as UnitID, US.Name as Unit,
   UP.UnitID as UnitID, UP.Name as Unit
FROM 
   Product PR 
INNER JOIN
   Unit UB on UB.UnitID = PR.BaseUnitID 
INNER JOIN
   Unit US on US.UnitID = PR.SecondaryUnitID 
INNER JOIN
   Unit UP on P.UnitID = PR.PrimaryUnitID 
where 
   Productid = 1

输出：

BaseUnitID   BaseUnit   SecondaryUnitID    SecondaryUnit   PrimaryUnitID   PrimaryUnit
----------   -------    ----------------   ------------   -------------   ------------
     1       PCS               2           CTN                   3         TRAY

SQL查询转换成这种形式

UnitID    Unit
------    ----
  1       PCS
  2       CTN
  3       TRAY

Answer 1

我不确定这是否是您所需要的，但也许可以为您提供帮助。

SELECT BaseUnitID UnitID, BaseUnit Unit FROM tbl UNION ALL
SELECT SecondaryUnitID, SecondaryUnit FROM tbl UNION ALL
SELECT PrimaryUnitID, PrimaryUnit FROM tbl

Answer 2

鉴于你的问题的编辑版本查询，你可以做你想做使用的是什么or或in联接条件：

SELECT U.UnitID as UnitID, U.Name as Unit
FROM Product PR inner join
     Unit U
     on U.UnitID in (PR.BaseUnitID, PR.SecondaryUnitID, PR.PrimaryUnitID)
where Productid = 1;

这是正确的查询