Microsoft OLE DB Provider For IBM DB2 Does Not Accept Common Table Expressions

Oct 26, 2007

After reading all the comments about microsoft ole db provider for db2, I've started converting a project from ibm db2 provider to microsoft ole db provider, for the reason that the server would not need a ibm client software installation anylonger.
However in one of the dataflows there is a select statement on the DB2 database (AS400 iseries DB2 V5R4) that uses common table expression. The Oledb data source in the Dataflow returns zero input columns when I use the microsoft provider instead of the ibm provider. When I set it back to use the ibm oledb provider the input columns are available again.
The common table expression is used in the select statement like:
WITH x AS (SELECT ... FROM mytable WHERE ...)
SELECT x.*, (x.a - x.b) As diff
FROM x

We are not allowed to change anything in the DB2 database, so using views or sprocs is not an option.

Did anyone else experience this and can it be avoided without changing the selct logic?

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Common Table Expressions

Aug 31, 2006

Hi guys,

I know its not a good idea to give you a big query...but/...

I have a query (given below) with Common table expressions. It is giving me error : The multi-part identifier "dbo.tmpValidServices_ALL.Service" could not be bound. for all the fields .. Do you have any idea.. I fed up with analysing query.. made me mad.. please help me...

----------------------------------------------

DECLARE @sql nvarchar(MAX), @paramlist nvarchar(4000)

SET @sql = 'WITH Q1 (SiteID,Programme,Complete,PID,COC,NotionalSum,TVMinsSUM,Postcode,Suburb,Qty)
AS

(SELECT
dbo.tmpValidServices_ALL.SiteID,
dbo.tmpValidServices_ALL.Programme,
dbo.tmpValidServices_ALL.Complete AS Complete,
dbo.tmpValidServices_ALL.RID AS PID,
dbo.tmpValidServices_ALL.COC# AS COC,
(dbo.lkpService.Notional$) AS NotionalSum,
(TVMins) AS TVMinsSUM,
dbo.tmpDemographics_ALL.Postcode,
dbo.tmpdemographics_ALL.Suburb,
                count(*) as Qty

FROM lkpService

INNER JOIN dbo.tmpValidServices_ALL vs ON dbo.lkpservice.code = dbo.tmpValidServices_ALL.Service
INNER JOIN dbo.tmpDemographics_ALL ON dbo.tmpValidServices_ALL.RID = dbo.tmpDemographics_ALL.RID '

IF @COCGroup IS NOT NULL
SELECT     @sql = @sql + 'LEFT OUTER JOIN dbo.lkpCOC c ON dbo.tmpValidServices_ALL.COC = c.pvcode '

SELECT     @sql = @sql + 'LEFT OUTER JOIN dbo.lkpAgency ag ON vs.SiteID = ag.EXACT# '

SELECT     @sql = @sql + 'WHERE dbo.lkpService.Schedule = @Schedule '

IF @StartDate IS NOT NULL
     SELECT     @sql = @sql + ' AND (dbo.tmpValidServices_ALL.Complete >= @StartDate ) '

IF @EndDate IS NOT NULL
      SELECT     @sql = @sql + ' AND (dbo.tmpValidServices_ALL.Complete <= @EndDate ) '

IF @SiteID IS NOT NULL
       SELECT     @sql = @sql + 'AND (ag.EXACT# = @SiteID) '

IF @COCGroup IS NOT NULL
SELECT     @sql = @sql + ' AND (c.pvcode = @COCGroup OR c.pvcode IN (SELECT COC FROM lkpCOCGroup WHERE COCGroup = @COCGroup)) '

IF @Provider IS NOT NULL
SELECT     @sql = @sql + 'AND (dbo.tmpValidServices_ALL.Provider = @Provider) '

IF @Postcode IS NOT NULL
SELECT     @sql = @sql + 'AND (dbo.tmpdemographics_ALL.Postcode = @Postcode) '

SELECT     @sql = @sql + ' GROUP BY dbo.tmpValidServices_ALL.SiteID,
                                                              dbo.tmpValidServices_ALL.Programme,
                                                              dbo.tmpValidServices_ALL.Complete ,
                                                              dbo.tmpValidServices_ALL.RID ,
                                                              dbo.tmpValidServices_ALL.COC# ,
                                                              dbo.tmpDemographics_ALL.postcode,
                                                              dbo.tmpdemographics_ALL.Suburb,
                                                              (dbo.lkpService.Notional$),
                                                              (dbo.lkpService.TVMins) )

SELECT COUNT(DISTINCT PID + CAST(Complete AS varchar(20)) + CAST(COC AS varchar(20)) + CAST(SiteID AS varchar(20)) + CAST(Programme AS varchar(20))) AS Visits,
COUNT(DISTINCT PID + CAST(SiteID AS varchar(20)) + CAST(Programme AS varchar(20))) AS Patients,
COUNT(DISTINCT CAST(COC AS varchar(20)) + CAST(SiteID AS varchar(20)) + CAST(Programme AS varchar(20)) + CAST(PID AS varchar(20))) AS COCs,
SUM(NotionalSum) AS NotionalSum,
SUM(TVMinsSUM) AS TVMinsSUM,Postcode,Suburb,sum(Qty) as Qty

FROM Q1

Group by Postcode,Suburb

Order by Postcode,Suburb '

SET              @paramlist = '@SiteID as numeric,
@COCGroup as varchar(20),
@Postcode as varchar(20),
@StartDate DateTime,
@EndDate DateTime,
@Schedule varchar(20),
@Provider varchar(20)'

EXEC sp_executesql @sql, @paramlist, @SiteID, @COCGroup, @Postcode, @StartDate, @EndDate, @Schedule, @Provider

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Distinct In Common Table Expressions CTE

Feb 20, 2007

I have managed to write my first CTE SQL that handles recursion but I have a problem with distinct - can't get that to work!!
My CTE:WITH StudentsHierarchy(SystemID1, GroupID, AccessType, AccessGroupID, StudentID, HierarchyLevel) AS
(
--Base Case
SELECT
SystemID,
GroupID,
AccessType,
AccessGroupID,
StudentID,
1 as HierarchyLevel
FROM UserGroup a

UNION ALL

--Recursive step
SELECT
u.SystemID,
u.GroupID,
u.AccessType,
u.AccessGroupID,
u.StudentID,
uh.HierarchyLevel + 1 as HierarchyLevel
FROM UserGroup u
INNER JOIN StudentsHierarchy uh ON
u.GroupID = uh.AccessGroupID

)
Select sh.SystemID1, sh.GroupID, sh.AccessType, sh.AccessGroupID, sh.StudentID, sh.HierarchyLevel, (select StudentName from Student s
where sh.StudentID = s.StudentID) AS StudentName from StudentsHierarchy sh
WHERE AccessType = 'S'

and I would like to have a distinct on the StudentID like:Select DISTINCT sh.StudentID, sh.SystemID1, sh.GroupID, sh.AccessType, sh.AccessGroupID, sh.StudentID, sh.HierarchyLevel, (select StudentName from Student s
where sh.StudentID = s.StudentID) AS StudentName from StudentsHierarchy sh
WHERE AccessType = 'S'

How should I do?