OpenRowSet and OpenQuery in SQL Server 2005/2008

Said both of the techniques (OpenRowSetand OpenQuery) are almost same and may confuse many developers. I have been asked many time personally by few of my team member in recent years as well as I have seen the same question in few forums like Experts-Exchange and Forums.Asp.Net.
Basically both commands requires to access remote data from other data source like other SQL Server or may be Oracle or may be Access or Excel or anything else. Basically both of these commands requires connection information of source database, table information etc.
OpenQuery gets all these information from Linked Server where as in OpenRowSet, you have to provide all these information at run time. There is no other difference.
Syntaxes of both the commands from Microsoft’s website:
( { ‘provider_name’ , { ‘datasource’ ; ‘user_id’ ; ‘password’
   | ‘provider_string’ }
   , {   [ catalog. ] [ schema. ] object
       | ‘query’
   | BULK ‘data_file’ ,
       { FORMATFILE = ‘format_file_path’ [ ]
} )
   [ , CODEPAGE = { ‘ACP’ | ‘OEM’ | ‘RAW’ | ‘code_page’ } ]
   [ , ERRORFILE = ‘file_name’ ]
   [ , FIRSTROW = first_row ]
   [ , LASTROW = last_row ]
   [ , MAXERRORS = maximum_errors ]
   [ , ROWS_PER_BATCH = rows_per_batch ]
   [ , ORDER ( { column [ ASC | DESC ] } [ ,…n ] ) [ UNIQUE ]
OPENQUERY ( linked_server ,'query' )
Let us see how does it works, we are going to create one access file named “acc1.accdb” and will create one Employee table inside “acc1.accdb” file which will be stored in D drive of computer. You can have your own access file at your desired location.
Here is the query for the same:
–add link server
exec sp_addlinkedserver
–if you have older version of access then kindly use old jet provider
–add MDB’s credental, if any
EXEC sp_addlinkedsrvlogin ‘LinkToAceess’, ‘false’
exec sp_serveroption [LinkToAceess],‘Data Access’,‘true’
–check whether ‘LinkToAccess’ has been added
select * from sys.servers
–list all tables available in Testing.MDB
exec sp_tables_ex ‘LinkToAceess’
–now query with OPENSOURCE
SELECT * FROM OPENQUERY(LinkToAceess, ‘SELECT id,empname FROM employee’)
–now query with OPENROWSET,
–which will not use our linked server
   FROM OPENROWSET(‘Microsoft.ACE.OLEDB.12.0’,
–if you get following error
–Msg 15281, Level 16, State 1, Line 1
–SQL Server blocked access to STATEMENT ‘OpenRowset/OpenDatasource’ of component ‘Ad Hoc Distributed Queries’ because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of ‘Ad Hoc Distributed Queries’ by using sp_configure. For more information about enabling ‘Ad Hoc Distributed Queries’, see “Surface Area Configuration” in SQL Server Books Online.
–you have to enable “Ad Hoc Distributed Queries”
sp_configure ‘show advanced options’,1
sp_configure ‘Ad Hoc Distributed Queries’,1
–now try again same query
Hope you have enjoyed!!!!
Reference: Ritesh Shah
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Author: Riteshshah

Ritesh Shah is a database professional with having 16+ years of experience in various domain of IT field. He is a author of many technical articles on Microsoft Technology and authored a book of SQL Server 2012 Performance Tuning cookbook. He loves work with different Microsoft Products.

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