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Normalizing with Update

Expert 100+
P: 164
Hello, I have run into an issue and need someone to explain a process to me in laymen's terms so I can understand it.

I have two [hypothetical] tables in MS Access. They are define thus:

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  1. Table: Products
  3. ID      Name    Customer
  4. -------+-------+-------
  5. 1       Pants   Bob
  6. 2       Shirt   Henry
  7. 3       Shoes    Dad
  8. 4       Socks   Dad
  9. 5       Apple   Henry
  10. 6       Banana  Henry
  11. 7       Orange  Henry
  13. Table: Customers
  15. ID      Name 
  16. -------+-------
  17. 1       Bob
  18. 2       Henry
  19. 3       Dad
  20. 4       Jacob
Please help me understand the SQL statement I could write in order to update 'Products' by replacing the data in the Customer column with the data in the ID column of 'Customers' which corresponds.
Apr 15 '09 #1
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4 Replies

Expert 2.5K+
P: 2,653
Something like the following:
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  1. UPDATE Products INNER JOIN Customers ON Products.Customer = Customers.Name SET Products.CustomerID = Customers.ID;
where Products.CustomerID is a new field with a relevant datatype (I guess Products.Customer and Customers.ID datatypes don't match)
Apr 15 '09 #2

Expert Mod 15k+
P: 31,707
First add a new field into your Products table called CustomerID. This would be of the same type as the [ID] field already in the Customers table, except that if Customers.ID is an AutoNumber field, CustomerID would have to be set as Long Integer.

That done, you would use SQL very similar to (identical with really) that which Fish has supplied already :
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  1. UPDATE Products INNER JOIN Customers
  2.     ON Products.Customer=Customers.Name
  3. SET    Products.CustomerID=Customers.ID
Apr 15 '09 #3

Expert 100+
P: 164
Delicious, thank you!
Apr 16 '09 #4

Expert Mod 15k+
P: 31,707
You're welcome :)

Anyone looking to normalise existing data is worth supporting as far as I'm concerned.
Apr 16 '09 #5

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