How to Split Data in TSQL - sql

Question

need some help figuring out how to split up some data
the Data Currently looks like this
╔═════════════════════════════════════════════╗
║ Name Data1 Data2 Data3 Field1 field2 Field3 ║
╠═════════════════════════════════════════════╣
║ a 1 2 3 x y z ║
╚═════════════════════════════════════════════╝
I need to split that data so that it looks like this
+-----------------+
| name data field |
+-----------------+
| a 1 x |
| a 2 y |
| a 3 z |
+-----------------+
can anyone help me with this

Answer 1

Depending on your version of SQL Server. Starting in SQL Server 2008, you can unpivot the data using CROSS APPLY:
SELECT t.name,
x.Data,
x.Field
FROM YourTable t
CROSS APPLY
(
VALUES
(t.Data1, t.Field1),
(t.Data2, t.Field2),
(t.Data3, t.Field3)
) x (Data, Field);
See SQL Fiddle with Demo.
This can also be done using the UNPIVOT and the PIVOT function in SQL Server 2005+:
select name, data, field
from
(
select name, left(col, len(col) -1) col, value,
row_number() over(partition by left(col, len(col) -1) order by col) rn
from
(
select name,
cast([Data1] as varchar(10)) Data1,
cast([Data2] as varchar(10)) Data2,
cast([Data3] as varchar(10)) Data3,
[Field1], [field2], [Field3]
from yourtable
) src
unpivot
(
value
for col in ([Data1], [Data2], [Data3],
[Field1], [field2], [Field3])
) unpiv
) u
pivot
(
max(value)
for col in (data,field)
) piv
See SQL Fiddle with Demo
Both give the result:
| NAME | DATA | FIELD |
-----------------------
| a | 1 | x |
| a | 2 | y |
| a | 3 | z |

Answer 2

There are many ways to do this (just look at bluefeet's answer), but a simple way can be using UNION ALL :
SELECT [Name], Data1 AS Data, Field1 AS Field
FROM YourTable
UNION ALL
SELECT [Name], Data2 AS Data, Field2 AS Field
FROM YourTable
UNION ALL
SELECT [Name], Data3 AS Data, Field3 AS Field
FROM YourTable
And here is a fiddle with a demo for this (courtesy of bluefeet).