根据一个表中的唯一 ID 连接多个表

Question

I am wanting to join multiple tables based on a ID I fetch from the first table.

Here is an example:

Location:

ID	LocationID
1	25
2	15
3	33

Serialized Table:

LocationID	PoductID	SerialNumber
25	4545454	ABC123
25	1231233	CBA321
25	5432121	BCA213

NonSerialized Table:

LocationID	PoductID	Quantity
25	6786788	3
25	9898989	15
25	8786678	24

I am trying to return a table that looks like this Result Table

ID	Location_ID	Product_ID	Serial_Num	Quantity
1	25	4545454	ABC123	NULL
1	25	1231233	CBA321	NULL
1	25	5432121	BCA213	NULL
1	25	6786788	NULL	3
1	25	9898989	NULL	15
1	25	8786678	NULL	24

SELECT
    Location.ID AS ID,
    Location.LocationID AS Location_ID,
    *** NOT SURE how to fetch ProductID From Both Tables *** Product_ID, 
    Serialized.SerialNumber AS Serial_Num,      
    NonSerialized.Quantity AS Quantity,
    FROM Location
    INNER JOIN NonSerialized ON Location.LocationID = NonSerialized.LocationID
    INNER JOIN Serialized ON Location.LocationID = Serialized.LocationID
    WHERE Location.ID = 1 

Answer 1

select loc.Id, loc.locationId, s.ProductId, s.SerialNumber, null as Quantity   
from Location loc
inner join Serialized s on loc.LocationId = s.locationId
where loc.Id = 1
union
select loc.Id, loc.locationId, ns.ProductId, null, ns.Quantity   
from Location loc
inner join nonSerialized ns on loc.LocationId = ns.locationId
where loc.Id = 1

would do it. You need to union data from 2 sets of data.

Answer 2

You need to do a union, to get the rows from both tables:

select loc.ID, loc.LocationID, s.ProductID, s.SerialNumber, 
       null as Quantity
  from Location loc
  join Serialized s on s.ID = loc.ID
union all
select loc.ID, loc.LocationID, ns.ProductID, null as SerialNumber, 
       ns.Quantity
  from Location loc
  join NonSerialized ns on ns.ID = loc.ID

Answer 3

To avoid joining Location multiple times , you can put the UNION ALL inside a derived table

select
  loc.Id,
  loc.locationId,
  s.ProductId,
  s.SerialNumber,
  s.Quantity   
from Location loc
inner join (
    select
      s.locationId,
      s.SerialNumber,
      null as Quantity
    from Serialized s
    union all
    select
      ns.locationId,
      null,
      ns.Quantity
    from nonSerialized ns
) s on loc.LocationId = s.locationId
where loc.Id = 1;