如何从Oracle间隔值获取MILLISECOND？

Question

如何从Oracle间隔值获取MILLISECOND？

例如，如果间隔值为

'+000000000 00:12:59.144721'

那么结果将是

145

Answer 1

我认为你只能这样做：

WITH t AS (
    SELECT INTERVAL '0 00:12:59.144721' DAY TO SECOND AS intv
    FROM dual)
SELECT 
    1000 * ROUND(
        EXTRACT(SECOND FROM intv) - TRUNC(EXTRACT(SECOND FROM intv)),
    3) AS MILLISECOND 
FROM t;