SQL如何计算案例

Question

我试图说明一个选择声明。 但是，早上7点8点9点等有多个结果。我希望结果显示：

数时间
上午10点半
早上6点8分

相反，它显示所有8ams所有8ams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7个ams8ms组合在一起。 Count(*)计算每个组中的行数。

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条件下的第二个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。 请注意，ORDER BY不完美，因为排序是基于文本的（所以10am和11am条目将出现在7am到9am之前）。 如果您不喜欢这样，请使用文本可排序的格式，例如07或0700或0700-07:59而不是'am'标记的时间。

这不可扩展。 您需要更加努力地处理CASE语句中的内容。

也许：

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

然后，WHERE子句中的限制条件为搜索提供了正确的限制。

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

为了让它按照您的预期运行，请使用以下内容...但是，可能有一种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

你只想要这个：

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)