topic dsn and schema in SAS Procedures

dsn and schema

Mike_Davis — Mon, 04 Jun 2012 13:09:35 GMT

Hello everyone,

when I connect to SQL server with SAS ,I use the code as below.

Could anybody please help me explain what is the defference between sdn and schema?

Thanks!

Mike

libname mydatas odbc

dsn=name1

schema=dbo;

Re: dsn and schema

Mike_Davis — Mon, 04 Jun 2012 13:54:40 GMT

seems like dsn(data source name) denotes database's name

schema specify a subfolder under this database(there would be many tables(datasets) under the schema specified folder, these tables(datasets) will be listed in under the libname folder of SAS )

Re: dsn and schema

Reeza — Mon, 04 Jun 2012 15:50:43 GMT

That's a good way to think of it.

In SQL you refer to tables using a two level system schema.table_name and then variables with a three level system, schema.table_name.variable_name

SAS uses different notation so you need to specify your schema in the database connection to allow SAS to appropriately transfer the names.

I've seen the schema used to differentiate different programs that are stored/warehoused in the same db.

Re: dsn and schema

SAPPER — Mon, 04 Jun 2012 17:22:46 GMT

Mike,

http://support.sas.com/documentation/cdl/en/acreldb/63647/HTML/default/viewer.htm#titlepage.htm

Check the link out and it has database specific properties of the connection string. This should help you out!

Thanks

SAPPER.

Re: dsn and schema

Mike_Davis — Mon, 04 Jun 2012 20:55:38 GMT

Thank you Sapper,

After the libname statement was finished,I found some of these tables in the SQL server didn't show up in the SAS folder. what cause this happen?

Thanks!

Mike

Re: dsn and schema

Reeza — Mon, 04 Jun 2012 21:19:57 GMT

Are the table names longer than 32 characters?

Re: dsn and schema

Alpay — Tue, 05 Jun 2012 05:23:30 GMT

If the table names are longer than 32 characters one way they can be accessed is by using SQL Pass Through.

proc sql;

connect to odbc(dsn=name1);

create table x as

select *

from connection to odbc(

select *

from dbo.<sqlservertablenamelongerthan32characters>

);

disconnect from odbc;

quit;

Zafer

Re: dsn and schema

Ksharp — Tue, 05 Jun 2012 05:53:03 GMT

Does your table name contain some special character , such as white blank $ # ?

And use libname option reserve_table_names=yes can update and display it.

Ksharp