Interval interval '300' month 结果是:+25-00 Interval '54-2' year to month 结果是:+54-02interval '11:12:10.1234567' hour to second结果是:+00 11:12:10.123457
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![Interval interval '300' month 结果是:+25-00 Interval '54-2' year to month 结果是:+54-02interval '11:12:10.1234567' hour to second结果是:+00 11:12:10.123457](/uploads/image/z/13275883-19-3.jpg?t=Interval+interval+%27300%27+month+%E7%BB%93%E6%9E%9C%E6%98%AF%EF%BC%9A%2B25-00+Interval+%2754-2%27+year+to+month+%E7%BB%93%E6%9E%9C%E6%98%AF%EF%BC%9A%2B54-02interval+%2711%3A12%3A10.1234567%27+hour+to+second%E7%BB%93%E6%9E%9C%E6%98%AF%EF%BC%9A%2B00+11%EF%BC%9A12%EF%BC%9A10.123457)
Interval interval '300' month 结果是:+25-00 Interval '54-2' year to month 结果是:+54-02interval '11:12:10.1234567' hour to second结果是:+00 11:12:10.123457
Interval
interval '300' month 结果是:+25-00
Interval '54-2' year to month 结果是:+54-02
interval '11:12:10.1234567' hour to second结果是:+00 11:12:10.123457
Interval interval '300' month 结果是:+25-00 Interval '54-2' year to month 结果是:+54-02interval '11:12:10.1234567' hour to second结果是:+00 11:12:10.123457
由于MONTH 默认是2为有效位数,所以不能是300,就表示成YEAR TO MONTH 于是成了+25-00
第二个不够2位补0,第三个最后一位默认6位,收上来就是123457了
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