Stored Procedure with Columns coming from Criteria

here's what i'm trying to do. i have a table that keeps track of dates for tasks on a object (a lot in this case) in the following way:

id    projectid   lotid    taskid      date
1       1              1           1       1/1/2006

what i need to do is create a stored procedure with only 4 columns where 2 of the columns come from criteria on the taskid. so say for instance i wanted to know all the dates entered on all lots for tasks 1 and 2 where those tasks are 2 of the columns

projectid   lotid       task1         task2
  1               1       1/1/2006  1/1/2007

how would i go about doing this? i actually need to do this for only those lots where task1 and task2 both have dates (neither can be null), so if that makes it easier (not having to catch records that don't exist), all the better.

LVL 12
craskinAsked:
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nmcdermaidCommented:
I think you're looking for a crosstab.

DO you want to be able to add more columns... i.e. will it ever look like this:

projectid   lotid       task1         task2       task3         task5
  1               1       1/1/2006  1/1/2007   5/1/2007   6/1/2007

Does the column 'task1' indicate a record which taskid=1, and the column 'task2' indicate a record which taskid=2


If so you are after a crosstab.
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LowfatspreadCommented:
don't think he's specifcally after a cross tab or pivot ...

isn't it more like

create  procedure usp_trackTasks (@Taskid1 int, @taskid2 int )
as
set nocount on

select *,identity(int,1,1) as rowid into #temp1 from yourtable where taskid=@taskid1
order by projectid,lotid,date
select *,identity(int,1,1) as rowid into #temp2 from yourtable where taskid=@taskid2
order by projectid,lotid,date

select coalesce(a.projectid,b.projectid) as projectid
         ,coalesce(a.lotid,b.lotid) as lotid
         ,a.date as task1
         ,b.date as task2
from #temp1 as a
full outer join #temp2 as b
  on a.projectid=b.projectid
 and a.lotid=b.lotid
 and a.rowid=b.rowid
order by 1,2,coalesce(a.rowid,b.rowid)
return
go
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dqmqCommented:
Or maybe it's as simple as this :>)

create  procedure usp_TaskPairs (@Taskid1 int, @taskid2 int )
as
set nocount on

SELECT T1.projectID, T1.lotID, T1.[Date] AS Task1, T2.[Date] AS Task2
FROM yourtable T1 INNER JOIN yourtable T2
ON T1.ProjectID = T2.ProjectID
AND T1.LotID = T2.LotID
WHERE T1.TaskID=@Taskid1
AND T2.TaskID=@Taskid2  
ORDER BY T1.projectid, T1.lotid, T1.
go
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dqmqCommented:
Got a little carried way. It should be:
ORDER BY T1.projectid, T1.lotid
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craskinAuthor Commented:
task1 is the task where taskid = 1

i do not need all tasks as columns, only two of them. i'm trying lowfat's suggestion, but i'm getting the error

Cannot add identity column, using the SELECT INTO statement, to table '#temp1', which already has column 'ID' that inherits the identity property.
0
craskinAuthor Commented:
when i change the select *,identity to
select ProjectNumber,Lot,Date,identity(int,1,1) as rowid

i get the error

Invalid column name 'rowid'.
0
craskinAuthor Commented:
ok, i think i got it working. thanks lowfat!
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Microsoft SQL Server 2005

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