How to split a row in multiple rows SQL Server? - sql

Question

I want to convert a row in sql table to multiple rows in other table.
example: say if i'm having a table 'UserDetail' and he has 2 address's (home, office...) then the table looks like...
I wand the result to be in the second table as shown in the image

Answer 1

We can use Cross Apply
;WITH CTE(UseriD,Address1Line,Address1City,Address1State,Address2Line,Address2City,Address2State )
AS
(
SELECT 1,'Line1','City1','State1','Line2','City2','State2'
)
SELECT UseriD,[Address],City,[State]
FROM CTE
CROSS APPLY ( VALUES (Address1Line,Address1City,Address1State ),
(Address2Line,Address2City,Address2State )
)AS Dt([Address],City,[State])
Result
UseriD Address City State
-----------------------------
1 Line1 City1 State1
1 Line2 City2 State2
Demo:http://rextester.com/KHFUM28227

Answer 2

You could use "union all" to do that like:
select * into newTable
from
(
select UserId, Address1Line as Address, Address1City as City, Address1State as State
from myTable
union all
select UserId, Address2Line as Address, Address2City as City, Address2State as State
from myTable
) tmp
If you use just UNION instead of UNION ALL you would also be removing the duplicates where Address1 and Address2 is same.

Answer 3

You can CROSS JOIN or CROSS APPLY the table to a list of numbers.
Then use IIF or CASE to get the correspondent numbered fields.
Or CROSS APPLY on the address values directly on the table.
Example snippet:
declare #UserTable table (UserId int, Address1Line varchar(30), Address1City varchar(30), Address1State varchar(30), Address2Line varchar(30), Address2City varchar(30), Address2State varchar(30));
insert into #UserTable (UserId, Address1Line, Address1City, Address1State, Address2Line, Address2City, Address2State) values
(1,'Wonder Lane 42','WonderTown', 'WonderState', 'Somewhere 1 B', 'Nowhere', 'Anywhere'),
(2,'Backstreet 69','Los Libros', 'Everland', 'Immortal Cave 777', 'Ghost City', 'The Wild Lands');
-- Cross Join on numbers
select UserId,
case n when 1 then Address1Line when 2 then Address2Line end as [Address],
case n when 1 then Address1City when 2 then Address2City end as [City],
case n when 1 then Address1State when 2 then Address2State end as [State]
from #UserTable u
cross join (values (1),(2)) as nums(n);
-- Cross Apply on Adress values
select UserId, [Address], [City], [State]
from #UserTable Usr
cross apply (values
(1, Address1Line, Address1City, Address1State),
(2, Address2Line, Address2City, Address2State)
) AS Addr(n, [Address], [City], [State]);
Both return:
UserId Address City State
------ ----------------- ---------- --------------
1 Wonder Lane 42 WonderTown WonderState
1 Somewhere 1 B Nowhere Anywhere
2 Backstreet 69 Los Libros Everland
2 Immortal Cave 777 Ghost City The Wild Lands