Connect to SQL Server Using Oracle SQL Developer

Step 1. Get the JDBC driver for MS SQL : If you don't already have one, download a JDBC driver for MS-SQL. I use the jTDS driver, which is open-source Java. It doesn't matter where you place it, but remember where.

First you need to get the right driver. You can find it here: http://sourceforge.net/projects/jtds/files/jtds/1.2.5/jtds-1.2.5-dist.zip/download
NOTE: For SQL Developer 4.0EA3 and SQL Developer Data Modeler 4.0 (production) you now need jtds-1.3.1. Get it here: http://sourceforge.net/projects/jtds/files/

Step 2. Load the JDBC driver : As explained in Oracle's tutorial, under Preferences, scroll down to Database and Third Party JDBC Drivers. Once you load the jtds-1.2 jar file you should see both SQL Server and it's aging uncle Sybase added to your list of options when creating a new database connection (You get Oracle and Access by default).

Step 3. Set up your new database connection : Now you can create a new MS SQL database connection the same you would an Oracle connection. The only difference is that you need to select the SQLServer tab instead of Oracle. If you don't see that tab, then something went wrong - either you got the wrong jar file or it didn't load correctly.