Help with insert query which replaces an original id with different value in sql ?

Question

UPDATE: Adding more Employee and ReplacementEmployee

Table Employee -

 EmployeeId   SerialNo
 ----------------------------- 
 1             11111  
 34            23233    
 23            13234  

Table ReplacementEmployee-

 ReplacementId   SerialNo
 ----------------------------- 
 11            11111  
 23            23233    
 13            13234  

So when I join these tables on Serial No. have something like this Mapping Table -

 EmployeeId   ReplacementId
 ----------------------------- 
 1             11    
 34            23    
 23            13  

So now I have insert all the data from table something like this OrignalTable and it can have multiple values for EmployeeId-

 EmployeeId   Name
 ----------------------------- 
 1             AAA    
 34            BBB    
 23            CCC  
 1             AAA

Into an table with different schema with basically something like this InsertTable and it can have multiple values for EmployeeId-

ReplacementId       Name
------------------------------- 
 11                AAA   
 23                BBB
 13                CCC  
 11                AAA

So if you look at the problem I need to insert data from one table to other but I need to insert a different field i.e. in this case I need to insert the corresponding ReplacementId instead of the EmployeeId in the new table. So can anyone suggest me how would I go about writing such a query ?

Answer 1

Try this:

INESRT INTO InsertTable (ReplacementID, [Name])
SELECT R.ReplacementID, O.[Name]
FROM OriginalTable O
INNER JOIN Employee E ON E.EmployeeID = O.EmployeeID
INNER JOIN ReplacementEmployee R ON E.SerialNo = R.SerialNo

And if you only want ONE instance of each employee in the InsertTable, use SELECT DISTINCT instead