问题
I'm trying to convert IBM Cognos SQL which contains a filter to Microsoft SQL Server Query.
I tried to apply the filter in the Microsoft SQL Server Query, but it didn't work.
Here the IBM Cognos Query:
IBM Cognos SQL
select
rank() over ( at client__iacode.ia_code order by XCOUNT(client_document.client_document_id for client__iacode.ia_code ) desc nulls last) as Rank_IA,
client__iacode.ia_code as IA_Code,
client__iacode.ia_short_descr as IA_Short_Descr,
XCOUNT(client_document.client_document_id for client__iacode.ia_code,client__iacode.ia_short_descr ) as Doc_Count,
XCOUNT(client.client_code at client__iacode.ia_code,client__iacode.ia_short_descr,client.client_id for client__iacode.ia_code,client__iacode.ia_short_descr ) as Client_Count,
XSUM(XCOUNT(client_document.client_document_id for client__iacode.ia_code,client__iacode.ia_short_descr ) at client__iacode.ia_code,client__iacode.ia_short_descr ) as Total_Doc_Count_,
XSUM(XCOUNT(client.client_code at client__iacode.ia_code,client__iacode.ia_short_descr,client.client_id for client__iacode.ia_code,client__iacode.ia_short_descr ) at client__iacode.ia_code,client__iacode.ia_short_descr ) as Total_Client_Count_
from
(
dbo.client client
join
dbo.broker client__broker
on (client.broker_id = client__broker.broker_id)
join
dbo.ia_code client__iacode
on (client.ia_code_id = client__iacode.ia_code_id)
join
dbo.client_document client_document
on (client.client_id = client_document.client_id)
join
dbo.client_status client_status
on (client.client_status_id = client_status.client_status_id)
join
dbo.provider client__provider
on (client__provider.provider_id = client.provider_id)
)
left outer join
dbo.branch client__iacode__branch
on (client__iacode.branch_id = client__iacode__branch.branch_id)
where
(client_document.requested_date is not NULL) and
(client_document.received_date is NULL) and
(client__iacode__branch.branch_descr = CAST(:PQ1 AS varchar(255))) and
(client__broker.broker_code = 'CCC') and
(client_status.client_status_code = 'A') and
((client__provider.provider_code <> 'PRS-R') or (client__provider.provider_code is NULL))
group by
client__iacode.ia_code,
client__iacode.ia_short_descr
filter
(rank() over ( at client__iacode.ia_code order by XCOUNT(client.client_code at client__iacode.ia_code,client.client_id for client__iacode.ia_code ) desc nulls last) <= 25) and
(RCOUNT(rank() over ( at client__iacode.ia_code order by XCOUNT(client_document.client_document_id for client__iacode.ia_code ) desc nulls last) at client__iacode.ia_code order by rank() over ( at client__iacode.ia_code order by XCOUNT(client_document.client_document_id for client__iacode.ia_code ) desc nulls last) asc,client__iacode.ia_code asc,client__iacode.ia_short_descr asc ) <= 25)
order by
Rank_IA asc,
IA_Code asc,
IA_Short_Descr asc
Here the Native SQL Query from the IBM Cognos report studio:
select "client__iacode"."ia_code" AS "C0", "client_documen
t"."client_document_id" AS "C1", "client__iacode"."ia_short_descr" AS "C2", "client"."client_id" AS "C3", "client"."client_code" AS "C4"
from ((((("dbo"."client" "client" INNER JOIN "dbo"."broker" "client__broker" on "client"."broker_id" = "client__broker"."broker_id") INNER JOIN "dbo"."ia_code" "client__iacode" on "client"."ia_code_id" = "client__iacode"."ia_code_id") INNER JOIN "dbo"."client_document" "client_document" on "client"."client_id" = "client_document"."client_id") INNER JOIN "dbo"."client_status" "client_status" on "client"."client_status_id" = "client_status"."client_status_id") INNER JOIN "dbo"."provider" "client__provider" on "client__provider"."provider_id" = "client"."provider_id") LEFT OUTER JOIN "dbo"."branch" "client__iacode__branch" on "client__iacode"."branch_id" = "client__iacode__branch"."branch_id"
where NOT "client_document"."requested_date" is null and "client_document"."received_date" is null and "client__iacode__branch"."branch_descr" = CAST( @BRANCH AS VARCHAR( 255 ) ) and "client__broker"."broker_code" = 'CCC' and "client_status"."client_status_code" = 'A' and ("client__provider"."provider_code" <> 'PRS-R' or "client__provider"."provider_code" is null)
Here the Microsoft SQL Server Query that I have created so far but it didn't shows me the expected result:
select L1.*
from
(
select L.Rank_IA,
L.IA_Code,
L.IA_Short_Descr,
L.Doc_Count,
L.Client_Count,
L.[Rank],
(count (L.Condition) over( order by L.Condition asc, L.IA_Code asc, IA_Short_Descr asc )) as Condition
from
(
select
rank() over ( order by COUNT(client_document.client_document_id ) desc ) as Rank_IA,
client__iacode.ia_code as IA_Code,
client__iacode.ia_short_descr as IA_Short_Descr,
COUNT( client_document.client_document_id ) as Doc_Count,
COUNT(client.client_code ) as Client_Count,
(rank() over ( order by COUNT( client.client_id ) desc ) ) as [Rank],
rank() over ( order by COUNT( client_document.client_document_id ) desc ) as Condition
--XSUM(XCOUNT(client_document.client_document_id for client__iacode.ia_code,client__iacode.ia_short_descr ) at client__iacode.ia_code,client__iacode.ia_short_descr ) as Total_Doc_Count_,
--XSUM(XCOUNT(client.client_code at client__iacode.ia_code,client__iacode.ia_short_descr,client.client_id for client__iacode.ia_code,client__iacode.ia_short_descr ) at client__iacode.ia_code,client__iacode.ia_short_descr ) as Total_Client_Count_
from
(
dbo.client client
join
dbo.broker client__broker
on (client.broker_id = client__broker.broker_id)
join
dbo.ia_code client__iacode
on (client.ia_code_id = client__iacode.ia_code_id)
join
dbo.client_document client_document
on (client.client_id = client_document.client_id)
join
dbo.client_status client_status
on (client.client_status_id = client_status.client_status_id)
join
dbo.provider client__provider
on (client__provider.provider_id = client.provider_id)
)
left outer join
dbo.branch client__iacode__branch
on (client__iacode.branch_id = client__iacode__branch.branch_id)
where
(client_document.requested_date is not NULL) and
(client_document.received_date is NULL) and
(client__iacode__branch.branch_descr = CAST(@BRANCH AS varchar(255))) and
(client__broker.broker_code = 'CCC') and
(client_status.client_status_code = 'A') and
((client__provider.provider_code <> 'PRS-R') or (client__provider.provider_code is NULL))
group by
client__iacode.ia_code,
client__iacode.ia_short_descr)L)L1
--filter
-- (rank() over ( at client__iacode.ia_code order by XCOUNT(client.client_code at client__iacode.ia_code,client.client_id for client__iacode.ia_code ) desc nulls last) <= 25) and
-- (RCOUNT(rank() over ( at client__iacode.ia_code order by XCOUNT(client_document.client_document_id for client__iacode.ia_code ) desc nulls last) at client__iacode.ia_code order by rank() over ( at client__iacode.ia_code order by XCOUNT(client_document.client_document_id for client__iacode.ia_code ) desc nulls last) asc,client__iacode.ia_code asc,client__iacode.ia_short_descr asc ) <= 25)
where L1.[Rank] <=25
and L1.Condition<=25
order by
Rank_IA asc,
IA_Code asc,
IA_Short_Descr asc
Can you please help me to apply that filter in the Microsft SQL Server code. Thanks in advance for the help.
回答1:
When generating the SQL on a Cognos query it will display both the Cognos SQL and the Native SQL. The Cognos SQL is what is required for the report and the Native SQL is what is being sent down to the database. If there is no local processing and the two SQL types are identical within reason, you should be able to use the SQL from the Native SQL dialog box without any edits.
回答2:
Cognos BI uses "dynamic query mode" by default (starting with 10.2.1). It's basically Cognos' query engine. The engine plans an execution which may include processing data locally after it is received from the data source. You may read all about it in IBM's free redbook here
http://www.redbooks.ibm.com/redbooks/pdfs/sg248121.pdf
Here is a quick overview of the engine
So, that means the native query is not the whole picture. Cognos may do more processing after receiving the data from MS SQL. That being said, if you would like to replicate the same query in MS SQL, you will need to complete the missing logic yourself. If the multi-dimensional model in Cognos is mapped to MS SQL relational database on 1:1, then that should be easy (convert missing parts from Cognos SQL to MS SQL yourself). Lots of the time, it is not that straight forward b/c the model inside Cognos may not be 1:1 mapping to MS SQL tables/columns. In that case, you will need to understand the model inside Cognos when converting Cognos query to MS SQL query b/c that's part of what happens between native query and Cognos query.
I can't be of any help on your model part but for the rest, you can first try changing the query's (or data source's) "Rollup Processing" property to "Database". That should help converting extended aggregate functions (XCOUNT etc) to native SQL. Also check out "Use SQL parameters" property and set it to "Literal" and see if that will helps with the parameters in native SQL.
Screenshot of the properties window
The rank() functions syntax is pretty much the same syntax in MS SQL so you should be able to handle that easily once you took care of extended functions. But I would look at the new native query first.
RCount (running count) can also be easily handled in MS SQL using windowing functions (see link below). But again, first generate the new native query and see if RCount is gone or not.
https://docs.microsoft.com/en-us/sql/t-sql/queries/select-over-clause-transact-sql?view=sql-server-ver15
回答3:
Here where the filters have been created. The filters is not showed in the Native SQL Query.
来源：https://stackoverflow.com/questions/63002567/convert-ibm-cognos-sql-which-contains-a-filter-to-microsoft-sql-server-query