Split One table into Two in SQL Server 2008 - sql

Question

I need to break one table (structure built by someone else but I need the data it contains thousands of records) into two new tables I created.
Table Name: Customers_Info (Old Table)
FullName Telephone Address
Adam Johnson 01555777 Michigan
John Smith 01222333 New York
John Smith 01222333 New Jersey
Lara Thomas 01888999 New Mexico
The above is the old table. Now I created two tables to hold the data, one table for customers with a default address, and the other table to hold additional addresses. In the shown example I need 3 persons to be listed in the Customers table, and the address of "John Smith" (the second one New Jersey) to be listed in the Addresses table.
The common field to look at here is "Telephone" and it's unique for every customer.
Here's how the result should be display.
Table Name: Customers (New Table)
CustomerID FullName Telephone Default_Address
1 Adam Johnson 01555777 Michigan
2 John Smith 01222333 New York
3 Lara Thomas 01888999 New Mexico
Table Name: Addresses (New Table)
AddressID CustomerID Address
1 2 New Jersey
Of course it was easy to copy all data into the new Customers table, but what I'm stuck at now, is how to remove the duplicates from Customers and insert them into the Addresses table with the Customer ID and Address only.
Thanks!

Answer 1

Give a try with below code and let me know the comments/results.
CREATE TABLE [Customers_Info]
(
FullName VARCHAR(50)
,Telephone VARCHAR(50)
,Address VARCHAR(50)
)
GO
CREATE TABLE Customers
(
CustomerID INT IDENTITY(1,1)
,FullName VARCHAR(50)
,Telephone VARCHAR(50)
,Default_Address VARCHAR(50)
)
GO
ALTER TABLE dbo.Customers ADD CONSTRAINT PK_Customers
PRIMARY KEY CLUSTERED (CustomerID);
GO
CREATE TABLE Addresses
(
AddressID INT IDENTITY(1,1)
,CustomerID INT
,[Address] VARCHAR(50)
)
GO
ALTER TABLE dbo.Addresses ADD CONSTRAINT PK_Addresses
PRIMARY KEY CLUSTERED (AddressID);
GO
ALTER TABLE Addresses ADD CONSTRAINT FK_CustomerID_Addresses_Customers FOREIGN KEY (CustomerID)
REFERENCES dbo.Customers(CustomerID);
GO
INSERT INTO [Customers_Info] VALUES ('Adam Johnson', '01555777', 'Michigan')
INSERT INTO [Customers_Info] VALUES ('John Smith' , '01222333', 'New York')
INSERT INTO [Customers_Info] VALUES ('John Smith' , '01222333', 'New Jersey')
INSERT INTO [Customers_Info] VALUES ('Lara Thomas' , '01888999', 'New Mexico')
INSERT INTO [Customers_Info] VALUES ('Lara Thomas' , '01888999', 'New Mexico1')
INSERT INTO [Customers_Info] VALUES ('Lara Thomas' , '01888999', 'New Mexico2')
INSERT INTO [Customers_Info] VALUES ('Adam Johnson', '01555777', 'Michigan1')
INSERT INTO [Customers_Info] VALUES ('Adam Johnson', '01555777A', 'Michigan')
INSERT INTO [Customers_Info] VALUES ('Adam Johnson', '01555777A', 'Michigan2')
GO
SELECT * FROM [Customers_Info]
--DELETE FROM Customers
--TRUNCATE TABLE Addresses
------------------------------------------------------------------------------------------------------------------
;WITH a as
(
SELECT FullName,Telephone,[Address],
rn = row_number() over (partition by FullName, Telephone order by FullName)
FROM [Customers_Info]
)
INSERT INTO Customers SELECT
FullName,Telephone,[Address] from a where rn = 1
------------------------------------------------------------------------------------------------------------------
;WITH b as
(
SELECT FullName,Telephone,[Address],
rn = row_number() over (partition by FullName, Telephone order by FullName)
FROM [Customers_Info]
)
INSERT INTO Addresses SELECT CI.CustomerID,b.[Address] FROM Customers CI
INNER JOIN b ON b.FullName=CI.FullName AND b.Telephone=CI.Telephone
WHERE b.rn>1
SELECT * FROM Customers
SELECT * FROM Addresses
DROP TABLE [Customers_Info]
GO
DROP TABLE Addresses
GO
DROP TABLE Customers
GO

Answer 2

It would be more normalized if you broke it up into one more table for three total tables. Have the Customers table that has only customer data, have the Address table (which you could possibly rename to State) that has only the Address, then a CustomerAddress table that has both keys to each of those tables as Foreign Keys.
I will start you off to begin:
INSERT INTO Customers (FullName, Telephone)
SELECT DISTINCT FullName, Telephone
FROM Customers_Info
You would do the same for Address. For the 3rd table, you would perform the lookups like this:
INSERT INTO CustomerAddress (CustomerID, AddressID)
SELECT C.CustomerID, A.AddressID
FROM Customers_Info CI
INNER JOIN Customers C
ON CI.Telephone = C.Telephone
INNER JOIN Address A
ON CI.Address = A.Address