Forcing a SQL Remote Query to filter remotely instead of locally

Question

I have a MS SQL Query that is pulling data via from a remote server. The data that I\'m pulling down needs to be filtered by a date that is determined at run time.. When

Answer 1

Can't you just send a query like this, or does the clr function have to actually be called inside the select statement?

Declare @datetime datetime
Set @datetime = dbo.MyCustomCLRDateFunction()

SELECT * FROM SERVER.Database.dbo.RemoteView
WHERE EntryDate > @datetime

Answer 2

You could also construct a string and use an openquery ...

set @sqlString =
 ' select into myTable from openquery
    (remoteServer,
        "SELECT * FROM Database.dbo.RemoteView WHERE EntryDate > %DTSTART"
    )
 '

set @sqlString  = 
    replace(@sqlString, '%DTSTART', 
                        (select cast(dbo.MyCustomCLRDateFunction() as char(8)) 
           )

EXECUTE sp_executesql @stmt=@sqlString

Answer 3

You need to properly decorate your CLR function to mark it as Deterministic, Precise and Data Access/System Data Access as DataAccessKind.None.