SQL如何计算大小写

Question

我正在尝试区分一个select语句。然而，早上7点，早上8点，早上9点等有多种结果。我希望结果显示:

计算时间7点10
6 8am

等。相反，它显示的是所有的7am所有的8am等等。

select
case
when aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 07:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '7am'
when aq.datestarted between to_date( '22-MAY-2014 08:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 08:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '8am'
when aq.datestarted between to_date( '22-MAY-2014 09:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 09:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '9am'
when aq.datestarted between to_date( '22-MAY-2014 10:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 10:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '10am'
when aq.datestarted between to_date( '22-MAY-2014 11:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '11am'
END as Time
from archivedqueue aq
where aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' )

Answer 1

select COUNT(*), Time
FROM
(SELECT
    case
    when aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 07:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '7am'
    when aq.datestarted between to_date( '22-MAY-2014 08:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 08:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '8am'
    when aq.datestarted between to_date( '22-MAY-2014 09:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 09:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '9am'
    when aq.datestarted between to_date( '22-MAY-2014 10:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 10:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '10am'
    when aq.datestarted between to_date( '22-MAY-2014 11:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '11am'
    END as Time
    from archivedqueue aq
    where aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' )) tempTable
GROUP BY Time

Group by Time将所有的7ams,8ams组合在一起。Count(*)计算每组的行数

Answer 2

SELECT COUNT(*) AS Count, Time
  FROM (SELECT case
               when aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 07:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '7am'
               when aq.datestarted between to_date( '22-MAY-2014 08:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 08:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '8am'
               when aq.datestarted between to_date( '22-MAY-2014 09:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 09:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '9am'
               when aq.datestarted between to_date( '22-MAY-2014 10:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 10:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '10am'
               when aq.datestarted between to_date( '22-MAY-2014 11:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 11:59:59', 'dd-mon-yyyy hh24:mi:ss' ) then '11am'
               END as Time
          FROM archivedqueue aq
         WHERE aq.datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 11:59:59', 'dd-mon-yyyy hh24:mi:ss' )
       ) name_required
 GROUP BY Time
 ORDER BY Time;

子查询是您编写的(除了在各种BETWEEN条件中的第二个TO_DATE中的修复);当您可以看到没有水平滚动的代码时，更容易发现问题!)，稍微重新格式化。注意，ORDER BY是不完美的，因为排序是基于文本的(因此10am和11am条目将出现在7am到9am条目之前)。如果您不喜欢这样，请使用文本可排序的格式，如07或0700或0700-07:59，而不是'am'标记的时间。

不可扩展。你需要更努力地研究CASE语句中的内容。

也许

:

TO_CHAR(aq.datestarted, 'yyyy-mm-dd hh24:00') AS time

WHERE子句中的限制条件然后提供正确的搜索限制。

SELECT COUNT(*) AS Count, TO_CHAR(aq.datestarted, 'yyyy-mm-dd hh:00') AS time
  FROM archivedqueue aq
 WHERE aq.datestarted BETWEEN to_date('22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss')
                          AND to_date('22-MAY-2014 11:59:59', 'dd-mon-yyyy hh24:mi:ss')
 GROUP BY Time
 ORDER BY Time;

Answer 3

要使其按您期望的方式工作，请使用下面的内容…然而，可能有比硬编码日期和时间更好的方法。

SELECT COUNT(*) AS 'Count', 
        CASE 
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 07:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '7am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 08:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 08:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '8am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 09:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 09:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '9am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 10:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 10:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '10am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 11:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '11am'
        END AS 'Time'
FROM archivedqueue aq
WHERE aq.datestarted BETWEEN to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' 
GROUP BY CASE 
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 07:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '7am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 08:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 08:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '8am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 09:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 09:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '9am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 10:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 10:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '10am'
            WHEN aq.datestarted BETWEEN to_date( '22-MAY-2014 11:00:00', 'dd-mon-yyyy hh24:mi:ss' ) AND to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' ) THEN '11am'
        END

Answer 4

你只需要这个:

select count(*) count, hour(datestarted) time
from rchivedqueue
where datestarted between to_date( '22-MAY-2014 07:00:00', 'dd-mon-yyyy hh24:mi:ss' ) and to_date( '22-MAY-2014 " 11:59:59', 'dd-mon-yyyy hh24:mi:ss' )
group by hour(datestarted)