DB2: Won't allow parameterize: 'fetch first <X> rows only'

问题

Although in Oracle DB its is allowed to parametrize the number of rows that the query can fetch by adding to the query:

select ...
from ...
where ...
and rownum <= @MaximumRecords

I can't add similar condition to acuivalent query running in DB2: It is allowed to add:

select ... 
from ...
where ...
fetch first 500 rows only

(where there is fixed number of rows) but not:

select ... 
from ...   
where ...      
fetch first :1 rows only

(:1 == @MaximumRecords)

Is someone aware of a solution/work-around to this problem?

回答1:

I think I found the solution. I just ran this query with a tool that gave a 0 default value to @MaximnumRecords and apperently DB2 doesn't allow to perform:
"fetch first 0 rows only" in any case - that was the problem.

来源：https://stackoverflow.com/questions/2621420/db2-wont-allow-parameterize-fetch-first-x-rows-only