Top 5 Session Error Messages

Displays by folder the top 5 most common error messages encountered by sessions.

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select "REPOSITORY_NAME",
"FIRST_ERROR_MSG",
"NUM",
"SUBJECT_AREA"
from (select * from ( SELECT  SESSION_REPOSIT_INFO.REPOSITORY_NAME,  to_char(SUBSTR(SESSION_LOG.FIRST_ERROR_MSG,1,254)) as FIRST_ERROR_MSG,  ALL_SESSIONS.SUBJECT_AREA,  (COUNT(SESSION_LOG.INSTANCE_ID)) as NUM, RANK() OVER(ORDER BY (COUNT(SESSION_LOG.INSTANCE_ID)) DESC) AS RANK  FROM  REP_LOAD_SESSIONS ALL_SESSIONS,  REP_SESS_LOG SESSION_LOG,  REP_REPOSIT_INFO SESSION_REPOSIT_INFO  WHERE  (ALL_SESSIONS.SESSION_ID = SESSION_LOG.SESSION_ID AND  ALL_SESSIONS.SESSION_VERSION_NUMBER = SESSION_LOG.TASK_VERSION_NUMBER AND  ALL_SESSIONS.SESSION_ID <> SESSION_REPOSIT_INFO.REPOSITORY_ID) AND  (TO_CHAR(SUBSTR(SESSION_LOG.FIRST_ERROR_MSG,1,254)) IS NOT NULL) AND  (TO_CHAR(SUBSTR(SESSION_LOG.FIRST_ERROR_MSG,1,254)) <> 'No errors encountered.' )  GROUP BY  SESSION_REPOSIT_INFO.REPOSITORY_NAME,  TO_CHAR(SUBSTR(SESSION_LOG.FIRST_ERROR_MSG,1,254)),  ALL_SESSIONS.SUBJECT_AREA  HAVING ((COUNT(SESSION_LOG.INSTANCE_ID)) IS NOT NULL ))  where RANK<6) "query"