Question

I have a need to create a table that maps two table values. There are no keys that can be used to join these tables but it is guaranteed that the number of rows in these two tables are guaranteed to be the same and lowest ID value in one maps to the lowest in other all the way to the highest. The actual ID itself will be different in the two tables

Is there a way to do this in SQL Server.

Thanks

Answer 1

In SQL Server 2005+:

WITH Table1Ranked AS (
  SELECT
    ID,
    rn = ROW_NUMBER() OVER (ORDER BY ID)
  FROM Table1
),
Table2Ranked AS (
  SELECT
    ID,
    rn = ROW_NUMBER() OVER (ORDER BY ID)
  FROM Table2
)
INSERT INTO MapTable (Table1ID, Table2ID)
SELECT t1.ID, t2.ID
FROM Table1Ranked t1
  INNER JOIN Table2Ranked t2 ON t1.rn = t2.rn