Hi @SAS_inquisitive,
Neither of these two captures error messages (in words). For error messages please see SYSERRORTEXT (and for warning messages SYSWARNINGTEXT).
In SYSCC and SYSERR you will find only codes, e.g. 1012. The difference between them is that SYSERR refers to the most recent DATA or PROC step (for some procedures), whereas SYSCC refers to the entire SAS session.
As a consequence, SYSERR is reset to 0 (the code for "Execution completed successfully and without warning messages" [see documentation]) after a step was completed successfully, but SYSCC would still contain the error code it received possibly many steps earlier. Also, SYSCC is not restricted to DATA and ("some") PROC steps, but captures errors also, e.g., in global statements such as an OPTIONS statement. SYSERR, however, would not change after such a statement (whether successful or not).
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