[英]oracle datetime group by
I want to group data based on date time in oracle eg:- 我想基于日期时间在oracle中对数据进行分组,例如:
03-DEC-13 06:12:03:23,
03-DEC-13 06:12:03:25,
04-DEC-13 08:12:03:23,
04-DEC-13 08:12:03:25
expected result :- 03-DEC-13 06:12:03, 04-DEC-13 08:12:03 预期结果:-03-DEC-13 06:12:03,04-DEC-13 08:12:03
neglect seconds. 忽略秒。
SELECT DISTINCT trunc(some_date, 'MI') FROM some_table;
Question is not completely clear, but I think something like: 问题尚不完全清楚,但我认为是这样的:
select to_char(datefield, 'DD-MMM-YY HH24:MI') , count(*) /* or other grouping */
from table
group by to_char(datefield, 'DD-MMM-YY HH24:MI')
If you want to include date/times for which you don't have a value, use something like join with a calendar table or a join with 如果要包括没有值的日期/时间,请使用日历表联接或联接
select to_date('20000101', 'YYYYMMDD') + level / 24 day_and_hours
from dual
connect by level <= 100
Check your performance when doing so. 这样做时请检查您的表现。
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