I am having a pl/sql problem. Getting this error message:
declare
*
ERROR at line 1:
ORA-00937: not a single-group group function
ORA-06512: at line 3
ORA-06512: at line 14

pl/sql
declare
cursor cursor_rollbackmonitor_cache is
select class, count
from v\$waitstat
where class in ('free list','system undo header','system undo block',
'undo header','undo block');
any ideas?