T-SQL query on dynamic field with pivot - sql-server

Question

i have 3 table PhoneBook, DynamicField, PhoneBook_DynamicField_Rel
PhoneBook :
|---ID----|---Name----|
1 Reza
2 Ali
DynamicField :
|---ID----|--Caption--|
1 Job
2 Level
PhoneBook_DynamicField_Rel:
|---ID----|--PhoneBookID--|--DynamicFieldID--|---Value---|
1 1 1 Emp
2 1 2 1
3 2 1 SomeJob
i want execute query with this result :
|--PhoneBookID--|--Name--|--Job--|--Level--|
1 Reza Emp 1
2 Ali SomeJob NULL

Answer 1

Maybe something like this:
Test data:
CREATE TABLE #PhoneBook(ID INT,Name VARCHAR(100))
INSERT INTO #PhoneBook VALUES(1,'Reza'),(2,'Ali')
CREATE TABLE #DynamicField(ID INT,Caption VARCHAR(100))
INSERT INTO #DynamicField VALUES(1,'Job'),(2,'Level')
CREATE TABLE #PhoneBook_DynamicField_Rel(ID INT,PhoneBookID INT,
DynamicFieldID INT,Value VARCHAR(100))
INSERT INTO #PhoneBook_DynamicField_Rel
VALUES(1,1,1,'Emp'),(2,1,2,'1'),(3,2,1,'SomeJob')
Getting the colums
DECLARE #cols VARCHAR(MAX)
SELECT #cols=STUFF
(
(
SELECT
',' +QUOTENAME(tbl.Caption)
FROM
#DynamicField AS tbl
FOR XML PATH('')
)
,1,1,'')
Then the query like this:
DECLARE #query NVARCHAR(4000)=
N'SELECT
*
FROM
(
SELECT
*
FROM
(
SELECT
PhoneBook.ID,
PhoneBook.Name,
field.Caption,
rel.Value
FROM
#PhoneBook AS PhoneBook
JOIN #PhoneBook_DynamicField_Rel AS rel
ON PhoneBook.ID = rel.PhoneBookID
JOIN #DynamicField AS field
ON rel.DynamicFieldID=field.ID
) AS SourceTable
) AS p
PIVOT
(
MAX(Value) FOR Caption IN('+#cols+')
) AS pvt'
EXECUTE(#query)
Then in my case I will drop the temp tables:
DROP TABLE #PhoneBook
DROP TABLE #DynamicField
DROP TABLE #PhoneBook_DynamicField_Rel

Answer 2

What you need is dynamic pivot:
declare #collist nvarchar(max)
SET #collist = stuff((select distinct ',' + QUOTENAME(caption)
FROM DynamicField
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
declare #q nvarchar(max)
set #q = '
select PhoneBookID, Name, ' + #collist + '
from (
select PhoneBookID, Name, Caption, Value
from (
select PhoneBookID, Name, Caption, Value
from PhoneBook pb
inner join PhoneBook_DynamicField_Rel pbdf on pb.ID = pbdf.PhoneBookID
inner join DynamicField df on df.ID = pbdf.DynamicFieldID
) as x
) as source
pivot (
max(Value)
for caption in (' + #collist + ')
) as pvt
'
exec (#q)