How to write where clause in pivot statement in SQL Server - sql

Question

I need to get records based on project and year
SELECT
*
FROM
(SELECT
Source,
val,
month
FROM
tbl_OrganicResult
CROSS APPLY
(VALUES ('visitors', visitors),
('UniqueVisitors', UniqueVisitors),
('ReturnVisitors', ReturnVisitors)) cs (Source, val)) A
PIVOT (Max(val)
FOR month IN ([jun], [jul)) pv
I need the records with where condition like
select *
from tbl_OrganicResult
where project = 'Homeocare'
Sample data
ProjectName Month Year visitors UniqueVisitors ReturnVisitors
Homeocare Jun 2015 400 33 22
Homeocare Jul 2015 100 10 8
debug test. Aug 2015 15222 122 120
debug test. Jun. 2015 1500 150 15
debug test. Jul 2015 1400 140 14
I'm getting records like this which is not correct, I mean I'm not getting project wise.
How to add where condition to get like where project - 'homeocare' ?
Getting output like this
Source jun jul
ReturnVisitors 8 120
UniqueVisitors 10 122
Visitors 100 15222
I need records like this
Source jun jul
ReturnVisitors. 22 8
UniqueVisitors. 33 10
Visitors 400 100
Sorry for my mistake of giving wrong data (earlier). Here always getting last 2 records and not used where condition to get records project and year wise.

Answer 1

The where clause should go after the cross apply like this:
SELECT
*
FROM
(
SELECT
Source,
val,
Year,
month
FROM
tbl_OrganicResult
CROSS APPLY
(VALUES ('visitors', visitors),
('UniqueVisitors', UniqueVisitors),
('ReturnVisitors', ReturnVisitors)) cs (Source, val)
WHERE ProjectName = 'Homeocare'
) A
PIVOT ( Max(val) FOR Month IN ([jun], [jul]) ) pv
Unless you only have data for one year in your table this query will get you the max value for a month from any year where you have data recorded for that month, for example if you had 100 visitors in June 15 and 200 visitors in June 14 then the value for June 14 would be selected. This might not be what you want.
I would consider doing something like this instead:
SELECT
Source, [Jun-2015], [Jul-2015]
FROM
(
SELECT
Source,
Val,
MonthYear = CONCAT(Month,'-',Year)
FROM
tbl_OrganicResult
CROSS APPLY
(VALUES ('Visitors', visitors),
('UniqueVisitors', UniqueVisitors),
('ReturnVisitors', ReturnVisitors)) cs (Source, Val)
WHERE ProjectName = 'Homeocare'
) A
PIVOT ( MAX(Val) FOR MonthYear IN ([Jun-2015], [Jul-2015]) ) pv ;

Answer 2

in your case you have three months but you are looking for july in place of june and August in place of july just add alias names for those columns
declare #table table (ProjectName varchar(20), Month varchar(20), Year varchar(20), visitors INT, UniqueVisitors INT, ReturnVisitors INT)
insert into #table (ProjectName,Month,Year,visitors,UniqueVisitors,ReturnVisitors)values
('Homeocare' , 'Jun' , 2015 , 400 , 33 , 22),
('Homeocare' , 'Jul' , 2015 , 100 , 10 , 8),
('debug test', 'Aug' , 2015 , 15222 , 122 , 120 )
SELECT source,JUN as Jul,jul as aug FROM (SELECT Source,
val,
month
FROM #table
CROSS apply (VALUES ('visitors',visitors),
('UniqueVisitors',UniqueVisitors),
('ReturnVisitors',ReturnVisitors)) cs (Source, val)) A
PIVOT (max(val)
FOR month IN ([jun],[Jul],
[Aug])) pv