greetings
I have this sql and want to count/group by.
SQL> select SUBSTR(msg, INSTR(msg, 'ORA-', -4),9) as ERR FROM sysman.mgmt$events where MSG like '%ORA-%' and rownum < 6;
ERR
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ORA-12505
ORA-12505
ORA-12505
ORA-28000
ORA-28000
Group by fails
select...