<b>Programmer skills</b>: SAP has it’s own proprietary language known as ABAP. It has been expanding to JAVA.
<b>DBA Skills</b>: SAP runs on many databases with Oracle and SQL Server being the ones I see most often. BASIS is SAP’s middleware that you must also become familiar with.
<b>OS Admin Skills:</b>UNIX/AIX/HPUX/LINUX, WINTEL w/Virtualization
Best of luck