how to get the desired output in sql server 2008 - sql-server-2008

Question

Table Structure
EID COLA COLB
1 name A
1 age 23
1 city hyd
1 email abc#live.in
1 mobile 45126
2 name B
2 age 43
2 city bang
3 name C
3 age 13
3 city bang
3 email jdf#live.in
I would like to have the output as below
ID||COLA||COLB
1||name||A
1||age||23
1||city||hyd
1||email||abc#live.in
1||mobile||45126
2||name||B
2||age||43
2||city||bang
2||email||NULL
2||mobile||NULL
3||name||C
3||age||13
3||city||bang
3||email||jdf#live.in
3||mobile||NULL
Can you kindly let me know how to achieve this output.
how to display the result where any of the mandatory fields (name,age,city,email,mobile)are missing then it should display as that field as Null, in the query we would provide in the where clause by filtering a single id value and cola as (name,age,city,email,mobile)
my Query:
select
case colA
when cola then colA+'||'+colB
end
from tbl
where cola in ('name','age','city','email','mobile')

Answer 1

Let me start by saying that what you are asking would have been really easy if your table structure had required columns like name, age, city etc. Name Value Pair is not a good design for such tables, not to mention serious performance issues which will plague any solution against this structure.
Having said that, you can use either PIVOT / UNPIVOT or an Attribute table (a table containing list of attribute required) and GROUP BY with CROSS JOIN.
Sample Data
DECLARE #table1 TABLE(
EID INT, COLA VARCHAR(30), COLB VARCHAR(30) )
INSERT INTO #table1 VALUES
(1,'name','A'),
(1,'age','23'),
(1,'city','hyd'),
(1,'email','abc#live.in'),
(1,'mobile','45126'),
(2,'name','B'),
(2,'age','43'),
(2,'city','bang'),
(3,'name','C'),
(3,'age','13'),
(3,'city','bang'),
(3,'email','jdf#live.in');
Query using PIVOT / UNPIVOT
SELECT EID, COLA,NULLIF(COLB,'') COLB
FROM
(
SELECT EID,ISNULL([name],'') name,ISNULL([age],'') [age],ISNULL([city],'') [city],ISNULL([email],'') [email],ISNULL([mobile],'') [mobile]
FROM (SELECT EID,COLA,COLB
FROM #table1) T
PIVOT ( MAX(COLB) FOR COLA IN ( [name],[age],[city],[email],[mobile] ) ) AS pvt
) tbl
UNPIVOT (COLB FOR ColA IN (name,age,city,email,mobile)) AS Upvt
Notice that I am using ISNULL(col,'') because UNPIVOT excludes NULL values. If '' is a valid value for you, you can use another string to denote NULL or use the GROUP BY solution.
Query using Attribute table and GROUP BY with CROSS JOIN
;WITH Cols(Name) AS
(
SELECT 'name' UNION ALL SELECT 'age' UNION ALL SELECT 'city' UNION ALL SELECT 'email' UNION ALL SELECT 'mobile'
)
SELECT t.EID,C.Name,t1.COLB
FROM
(
SELECT EID
FROM #table1
GROUP BY EID
) t
CROSS JOIN Cols c
LEFT JOIN #table1 t1 ON t1.EID = t.EID and t1.COLA = C.Name

Answer 2

CREATE TABLE DesireOutput(EID nvarchar(10),COLA NVARCHAR(10),COLB nvarchar(50))
INSERT INTO DesireOutput VALUES ('1','name','A' )
INSERT INTO DesireOutput VALUES ('1','age','23')
INSERT INTO DesireOutput VALUES ('1','city','hyd')
INSERT INTO DesireOutput VALUES ('1','email','abc#live.IN')
INSERT INTO DesireOutput VALUES ('1','mobile','45126')
INSERT INTO DesireOutput VALUES ('2','name','B')
INSERT INTO DesireOutput VALUES ('2','age','43')
INSERT INTO DesireOutput VALUES ('2','city','bang')
INSERT INTO DesireOutput VALUES ('3','name','C')
INSERT INTO DesireOutput VALUES ('3','age','13')
INSERT INTO DesireOutput VALUES ('3','city','bang')
INSERT INTO DesireOutput VALUES ('3','email','jdf#live.IN')
DECLARE #t AS TABLE ( ColA NVARCHAR(50) )
INSERT INTO #t
SELECT DISTINCT
D.COLA
FROM DesireOutput D
SELECT t.EID , c.ColA , t1.COLB FROM ( SELECT
EID FROM DesireOutput GROUP BY EID
) t
CROSS JOIN #t c
LEFT JOIN DesireOutput t1 ON t1.EID = t.EID
AND t1.COLA = c.ColA ORDER BY EID