Transforming shape of a SQL Table using Pivot - sql

Question

I have some data stored in a table in the following format
BatchID EntityChanged ChangeValue
EERS ABC DEF
EERS ABCD XYZ
EERS Something SomeValue
New Batch SomethingMore GHI
The list of values that can appear in the "EntityChanged" columns is finite, known beforehand and has no spaces etc in it. For the sake of argument let us say that this list is - ABC, ABCD, Something, SomethingMore
Then for the above dataset I would like an output of
BatchID ABC ABCD Something SomethingMore
EERS DEF XYZ SomeValue NULL
New Batch NULL NULL NULL GHI
Using Pivot I could only go so far.
Can someone please help me slice this data in the desired way?

Answer 1

You can use a PIVOT for this, either via Static PIVOT or a Dynamic PIVOT which might be good if you have a unknown number of columns.
Static (See SQL Fiddle with Demo):
create table t2
(
batchid varchar(10),
entitychanged varchar(20),
changevalue varchar(10)
)
insert into t2 values ('EERS', 'ABC', 'DEF')
insert into t2 values ('EERS', 'ABCD', 'XYZ')
insert into t2 values ('EERS', 'Something', 'SomeValue')
insert into t2 values ('New Batch', 'SomethingMore', 'GHI')
select *
from
(
select batchid, entitychanged, changevalue
from t2
) x
pivot
(
min(changevalue)
for entitychanged in ([ABC], [ABCD], [Something], [SomethingMore])
) p
Dynamic (see SQL Fiddle with Demo):
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
select #cols = STUFF((SELECT distinct ',' + QUOTENAME(entitychanged)
from t2
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT batchid, ' + #cols + ' from
(
select batchid, entitychanged, changevalue
FROM t2
) x
pivot
(
min(changevalue)
for entitychanged in (' + #cols + ')
) p '
execute(#query)
Both will give you the same result.

Answer 2

Try this:
SELECT BatchID,
MAX(CASE WHEN EntityChanged = 'ABC' THEN ChangeValue END) 'ABC',
MAX(CASE WHEN EntityChanged = 'ABCD' THEN ChangeValue END) 'ABCD',
MAX(CASE WHEN EntityChanged = 'Something' THEN ChangeValue END) 'Something',
MAX(CASE WHEN EntityChanged = 'SomethingMore' THEN ChangeValue END) 'SomethingMore'
FROM YourTable t
GROUP BY BatchID
DEMO