Showing posts with label Link. Show all posts
Showing posts with label Link. Show all posts

Thursday, July 17, 2014

Compatibility Issues with MS Access and SQL Server


In most organizations , Power Users use MS Access to query the data from other RDBMS (via ODBC) for their reporting needs. 
For this approach , their learning curve is minimal ; the downside is that there are few compatibility issues ( with data types) ; Performance , and so on.

In my view , it is better that they should reporting tools that takes advantage of RDBMS in a native way. 

Let us look at one of my compatibility issues . Not all datatypes translates nicely in MS-Access. 
The datatypes  'datetime2' and 'bigint' are some of them. 

Here is an example . 

Created a table called 'DimDate' with one of the column as 'bigint'. 

a) Here is the Structure of the table in SQL Server via SSMS ( SQL Server Management Studio) 



b) Here is the data viewed in SQL Server via SSMS. 





I have linked this table in MS Access . 

c) Structure of the table in  MS-Access 



d) Data viewed in MS-Access 





Changed the data to int; and re-linked the table in MS Access. 


f) Structure of the table in SQL Server via SSMS 



g) Structure of the table in  MS-Access 



h) Data viewed in MS-Access 



Apart from the datatypes issues , there are performance issues especially , when you link a view in MS-Access ,  it offloads all the data in the underlying base table  to MS-Access and performs the filter criteria at the client , which is not the best way to do queries. 

Comments welcome.