您可以使用来分隔小时,分钟和秒SUBSTR
,然后将SUM
其向上,最后使用NUMTODSINTERVAL
function将其转换为INTERVAL
type。
SELECT NUMTODSINTERVAL (SUM (total_secs), 'second')
FROM (SELECT SUBSTR (duration, 1, 2) * 3600
+ SUBSTR (duration, 4, 2) * 60
+ SUBSTR (duration, 7, 2) total_secs
FROM user_tab);