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WITH t(period, string) AS ( SELECT 1, 'This is Some text' FROM dual UNION ALL SELECT 2, 'more text' FROM dual UNION ALL SELECT 3, 'this could be soMe more text' FROM dual ), t2 AS ( SELECT REGEXP_SUBSTR(LOWER(string),'[^[:space:]]+',1,level) AS word FROM t CONNECT BY level <= REGEXP_COUNT(LOWER(string),'[:space:]') + 1 AND PRIOR SYS_GUID() IS NOT NULL AND PRIOR period = period ) SELECT word, COUNT(*) AS count FROM t2 WHERE word IS NOT NULL GROUP BY word
WORD
COUNT
this
2
be
1
text
3
more
2
is
1
some
2
could
1