Question

I have two tables such as TableA and TableB.

Schema for TableA:

     UoMID
     UoMName

Schema for TableB:

     ItemID
     ItemName
     UoMID
     D1_UoMID
     D2_UoMID
     D3_UoMID

Here I want to Join Both these tables based on UoMID in the TableA and UoMID, D1_UoMID, D2_UoMID and D3_UoMID in the TableB.
I want to retrieve the following columns:

     ItemName, UoMName, D1_UoMName, D2_UoMName and D3_UoMName

How to retreive the above columns? and How do I identify the UoMName for the Corresponding UoMID, D1_UoMID, D2_UoMID and D3_UoMID?

Answer 1

Using aliases, you can join to the same table multiple times and distinguish the results of the different joins. Try this:

SELECT
    ItemName,
    d0.UoMName,
    d1.UoMName as D1_UoMName,
    d2.UoMName as D2_UoMName,
    d3.UoMName as D3_UoMName
from TableB tb
join TableA d0 on d0.UoMID = tb.UoMID
join TableA d1 on d1.UoMID = tb.D1_UoMID
join TableA d2 on d2.UoMID = tb.D2_UoMID
join TableA d3 on d3.UoMID = tb.D3_UoMID;