Question

I am trying to update multiple rows with different values, but don’t need to match any specific ID.

Of course, both columns on two different tables will have a same number of records.

Example, I have a table Table1 and Column1 and a query with list 10 items in that table (the ID is not consecutive).

ID  ItemName
1    Item1
2    Item2
4    Item3
5    Item4
6    Item5
8    Item6
9    Item7
14    Item8
18    Item9
23    Item10

Now, I have another table Table2 and Column2 that I want to update with those 10 items above.

This also has different IDs, but ItemName is blank/null value.

ID   ItemName
301    NULL
321    NULL
323    NULL
331    NULL
333    NULL
335    NULL
336    NULL
355    NULL
377    NULL
388    NULL

So, I a looking for a query where I can update the Table2 and Column2 with those 10 items from Table1, and the result looks like this

ID   ItemName
301    ITem1
321    ITem2
323    ITem3
331    ITem4
333    ITem5
335    ITem6
336    ITem7
355    ITem8
377    ITem9
388    ITem10

Please help. Thanks in advance.

Answer 1

WITH CTE1
     AS (SELECT *,
                Row_number() OVER (ORDER BY ID) AS RN
         FROM   Table1),
     CTE2
     AS (SELECT *,
                Row_number() OVER (ORDER BY ID) AS RN
         FROM   Table2)
UPDATE CTE2
SET    ItemName = CTE1.ItemName
FROM   CTE2
       JOIN CTE1
         ON CTE1.RN = CTE2.RN 

SQL Fiddle