Oracle: посчитать число индексов по char/varchar-колонкам

SELECT COUNT(DISTINCT i.INDEX_NAME)
FROM dba_ind_columns i
    JOIN dba_tab_columns c
        ON (c.TABLE_NAME = i.TABLE_NAME AND c.OWNER = i.TABLE_OWNER AND c.COLUMN_NAME = i.COLUMN_NAME)
WHERE
    (UPPER(c.DATA_TYPE) LIKE 'VARCHAR%'
        OR UPPER(c.DATA_TYPE) LIKE 'CHAR%')