将日期四舍五入为 10 分钟间隔
我有一个 DATE
列,我想在查询中舍入到下一个较低的 10 分钟间隔(请参见下面的示例)。
我设法通过截断秒然后减去分钟的最后一位数字来做到这一点。
WITH test_data AS (
SELECT TO_DATE('2010-01-01 10:00:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:05:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:09:59', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:10:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2099-01-01 10:00:33', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
)
-- #end of test-data
SELECT
d, TRUNC(d, 'MI') - MOD(TO_CHAR(d, 'MI'), 10) / (24 * 60)
FROM test_data
这是结果:
01.01.2010 10:00:00 2010年1月1日 10:00:00
01.01.2010 10:05:00 2010年1月1日 10:00:00
01.01.2010 10:09:59 2010年1月1日 10:00:00
01.01.2010 10:10:00 2010年1月1日 10:10:00
01.01.2099 10:00:33 01.01.2099 10:00:00
按预期工作,但有更好的方法吗?
编辑:
我对性能很好奇,所以我用 500.000 行和(不是真正的)随机日期进行了以下测试。我将把结果作为评论添加到所提供的解决方案中。
DECLARE
t TIMESTAMP := SYSTIMESTAMP;
BEGIN
FOR i IN (
WITH test_data AS (
SELECT SYSDATE + ROWNUM / 5000 d FROM dual
CONNECT BY ROWNUM <= 500000
)
SELECT TRUNC(d, 'MI') - MOD(TO_CHAR(d, 'MI'), 10) / (24 * 60)
FROM test_data
)
LOOP
NULL;
END LOOP;
dbms_output.put_line( SYSTIMESTAMP - t );
END;
此方法花费了 03.24 s
。
I have a DATE
column that I want to round to the next-lower 10 minute interval in a query (see example below).
I managed to do it by truncating the seconds and then subtracting the last digit of minutes.
WITH test_data AS (
SELECT TO_DATE('2010-01-01 10:00:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:05:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:09:59', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2010-01-01 10:10:00', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
UNION SELECT TO_DATE('2099-01-01 10:00:33', 'YYYY-MM-DD HH24:MI:SS') d FROM dual
)
-- #end of test-data
SELECT
d, TRUNC(d, 'MI') - MOD(TO_CHAR(d, 'MI'), 10) / (24 * 60)
FROM test_data
And here is the result:
01.01.2010 10:00:00 01.01.2010 10:00:00
01.01.2010 10:05:00 01.01.2010 10:00:00
01.01.2010 10:09:59 01.01.2010 10:00:00
01.01.2010 10:10:00 01.01.2010 10:10:00
01.01.2099 10:00:33 01.01.2099 10:00:00
Works as expected, but is there a better way?
EDIT:
I was curious about performance, so I did the following test with 500.000 rows and (not really) random dates. I am going to add the results as comments to the provided solutions.
DECLARE
t TIMESTAMP := SYSTIMESTAMP;
BEGIN
FOR i IN (
WITH test_data AS (
SELECT SYSDATE + ROWNUM / 5000 d FROM dual
CONNECT BY ROWNUM <= 500000
)
SELECT TRUNC(d, 'MI') - MOD(TO_CHAR(d, 'MI'), 10) / (24 * 60)
FROM test_data
)
LOOP
NULL;
END LOOP;
dbms_output.put_line( SYSTIMESTAMP - t );
END;
This approach took 03.24 s
.
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甚至
or even
我通常讨厌约会 ->字符->不需要时进行日期转换。我宁愿用数字。
这会提取当天的分钟数,将其截断为 10 分钟间隔,然后将其添加回去以使其再次成为日期。当然,您可以将 sysdate 替换为您想要的任何日期。它比我想要的更信任隐式转换,但至少它适用于任何 NLS 日期格式。
I generally hate doing date -> character -> date conversions when it's not necessary. I'd rather use numbers.
This extracts the minutes from the current day, truncates them down to the 10-minute interval, and then adds them back in to make it a date again. Of course, you can replace sysdate with whatever date you want. It trusts implicit conversions a lot more than I want but at least it'll work for any NLS date format.
您可以将返回的值作为字符串,并将左侧的子串到最后一分钟的数字,并将其替换为
0
。除非你提供某种指标,否则我不会说那更好。You could take the returned value as a string and substring the left side up to the last minute digit and replace it with a
0
. I wouldn't exactly say thats better unless you provide some kind of metric.不一定更好,但还有另一种方法:
Not necessarily any better, but another method:
另一种方法,
一种可能更快的替代方法,因为它删除了对 trunc 的调用。
Another method,
An alternative that might be quicker as it removes the call to trunc.
为了返回下一个上限 10 分钟间隔,我使用了以下查询。我希望它有用,因为我不能简单地执行
trunc(sysdate, 'mi') + mod(EXTRACT(min FROM cast(sysdate as timestamp)), 10) / (24 * 60)< /code>
我这样做了,它对我有用。
这是基于这篇帖子。
To return the next upper 10 minute interval, I used the following query. I hope it'll be useful because I couldn't simply do a
trunc(sysdate, 'mi') + mod(EXTRACT(minute FROM cast(sysdate as timestamp)), 10) / (24 * 60)
I did this and it worked for me.
This is based on this post.
我认为要解决这个问题,有一种更简单、更快捷的方法可以舍入到下一个较低的 10 秒、1 分钟、10 分钟等间隔。尝试使用 SUBSTR() 将时间戳作为字符串进行操作,如下所示:
I think to solve this there's a much easier and faster way to round to a next lower 10 seconds, 1 Minute, 10 Minute etc. interval. Try to manipulate your timestamp as a string using SUBSTR() like this: