sql - 如何创建跨多个字段的条件计数？

Question

我有一个包含超过 1 亿行数据的巨大表，该表连接到另一个我想为其创建条件计数的引用表。

第一个表是一个大表，它是一个审计日志，包含列出国家数据和审计日期的数据。第二个表是一个较小的表，其中包含与审计日志相关的数据。第一部分是简单的部分，即确定我想查看哪些审计数据。我有以下代码来识别这一点:

    select aud.*
    from audit_log aud
    join database db on db.id=aud.release_id
    where aud.event_description like '% opted in'
    and r.creation_source = 'system_a'

这为我提供了以下格式的数据:

Country             Event Description                                   Audit Date
Czech Republic      Czech Republic has been automatically opted in      11-AUG-14 07.01.52.606000000
Denmark             Denmark has been automatically opted in             12-AUG-15 07.01.53.239000000
Denmark             Denmark has been automatically opted in             11-SEP-15 07.01.53.902000000
Dominican Republic  Dominican Republic has been automatically opted in  11-SEP-15 07.01.54.187000000
Ecuador             Ecuador  has been automatically opted in            11-DEC-14 07.01.54.427000000
Ecuador             Ecuador has been automatically opted in             11-NOV-14 07.01.54.679000000

此查询的结果数仍返回超过 500 万行，因此我无法将数据导出到 Excel 以创建计数。我的两个主要问题是“审计日期”字段的行数和日期格式。

理想情况下，我想创建一个将数据显示为:

Country                |Aug-14|Nov-14|Dec-14|Aug-15|Sep-15
Czech Republic         |  1   |      |      |      |
Denmark                |      |      |      |  1   | 1
Dominican Republic     |      |      |      |      | 1
Ecuador                |      | 1    |  1   |      |        

关于如何提取月份和年份并将数字按国家/地区放入列中的任何想法？

谢谢

编辑 - 感谢 xQbert 提供的解决方案，它运行完美!现在的问题是我遇到了一个新问题。我需要通过另一个查询来限制计数，但所涉及的表之间没有唯一标识符。

例如，我修改了您的查询以适合我的数据库:

select cty.country_name, 
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2014' then 1 else 0 end) as "AUG-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2014' then 1 else 0 end) as "SEP-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='OCT-2014' then 1 else 0 end) as "OCT-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='NOV-2014' then 1 else 0 end) as "NOV-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='DEC-2014' then 1 else 0 end) as "DEC-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JAN-2015' then 1 else 0 end) as "JAN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='FEB-2015' then 1 else 0 end) as "FEB-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAR-2015' then 1 else 0 end) as "MAR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='APR-2015' then 1 else 0 end) as "APR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAY-2015' then 1 else 0 end) as "MAY-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUN-2015' then 1 else 0 end) as "JUN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUL-2015' then 1 else 0 end) as "JUL-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2015' then 1 else 0 end) as "AUG-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2015' then 1 else 0 end) as "SEP-15"
    from dschd.audit_trail aud
    join dschd.release r on r.id=aud.release_id
    join dschd.country cty on aud.EVENT_COUNTRY_ID=cty.id
    where aud.event_description like '% opted in'
    and r.creation_source = 'DSCHED'
    GROUP BY cty.COUNTRY_name

我的第二个查询是:

select  *
from DSCHD.RELEASE_COUNTRY_RIGHT rcr
join dschd.release r on rcr.RELEASE_ID=r.ID
join dschd.country cty on rcr.COUNTRY_ID=cty.id
where r.release_status in ('DRAFT', 'SCHEDULED', 'FINAL', 'DELIVERED')
and r.is_active = 'Y'
and rcr.MARKETING_RIGHT = 'Y'
and rcr.OPT_OUT = 'N'
and r.creation_source = 'DSCHED'

问题是我有许多国家可以与一个 ID (Release_ID) 相关，但在国家级别的表之间没有唯一标识符。不过每个国家/地区都有一个 ID。

因此，对于查询 1，要识别每个唯一的行，我需要“aud.Release_ID”和“aud.Event_country_id”，而对于查询 2 来实现相同的目的，我需要使用“rcr.Release_ID”和“rcr.country_id'.

select cty.country_name, 
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2014' then 1 else 0 end) as "AUG-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2014' then 1 else 0 end) as "SEP-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='OCT-2014' then 1 else 0 end) as "OCT-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='NOV-2014' then 1 else 0 end) as "NOV-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='DEC-2014' then 1 else 0 end) as "DEC-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JAN-2015' then 1 else 0 end) as "JAN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='FEB-2015' then 1 else 0 end) as "FEB-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAR-2015' then 1 else 0 end) as "MAR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='APR-2015' then 1 else 0 end) as "APR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAY-2015' then 1 else 0 end) as "MAY-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUN-2015' then 1 else 0 end) as "JUN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUL-2015' then 1 else 0 end) as "JUL-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2015' then 1 else 0 end) as "AUG-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2015' then 1 else 0 end) as "SEP-15"
    from dschd.audit_trail aud
    join dschd.release r on r.id=aud.release_id
    join dschd.country cty on aud.EVENT_COUNTRY_ID=cty.id
    where aud.event_description like '% opted in'
    and ***** in (select  ******
                 from DSCHD.RELEASE_COUNTRY_RIGHT rcr
                 join dschd.release r on rcr.RELEASE_ID=r.ID
                 join dschd.country cty on rcr.COUNTRY_ID=cty.id
                 where r.release_status in ('DRAFT', 'SCHEDULED', 'FINAL', 'DELIVERED')
                 and r.is_active = 'Y'
                 and rcr.MARKETING_RIGHT = 'Y'
                 and rcr.OPT_OUT = 'N'
                 and r.creation_source = 'DSCHED')
GROUP BY cty.COUNTRY_name

我被卡住的是两个部分，它们由'*****'表示，因为连接条件是两个字段。

有什么想法吗？

Answer 1

快速而肮脏，不是基于 12 个月周期或任何东西的动态 float ...

select country, 
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2014' then 1 else 0 end) as "AUG-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2014' then 1 else 0 end) as "SEP-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='OCT-2014' then 1 else 0 end) as "OCT-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='NOV-2014' then 1 else 0 end) as "NOV-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='DEC-2014' then 1 else 0 end) as "DEC-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JAN-2015' then 1 else 0 end) as "JAN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='FEB-2015' then 1 else 0 end) as "FEB-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAR-2015' then 1 else 0 end) as "MAR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='APR-2015' then 1 else 0 end) as "APR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAY-2015' then 1 else 0 end) as "MAY-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUN-2015' then 1 else 0 end) as "JUN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUL-2015' then 1 else 0 end) as "JUL-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2015' then 1 else 0 end) as "AUG-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2015' then 1 else 0 end) as "SEP-15"

    from audit_log aud
    join database db on db.id=aud.release_id
    where aud.event_description like '% opted in'
    and r.creation_source = 'system_a'
GROUP BY COUNTRY

理想情况下，我们会简单地使用 Pivot 语句或将其基于范围内的最早日期并继续...如在之前的堆栈文章中找到的 Dynamic pivot in oracle sql

根据不断变化的要求进行更新 您知道您可以根据多个条件加入吗？ :P

请注意，我们创建了一个内联 View ，您的第二个查询将其别名为 z 表名，然后添加需要匹配的两列作为结果的一部分。然后我们加入它，就好像它是一张 table 一样!

select cty.country_name, 
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2014' then 1 else 0 end) as "AUG-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2014' then 1 else 0 end) as "SEP-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='OCT-2014' then 1 else 0 end) as "OCT-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='NOV-2014' then 1 else 0 end) as "NOV-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='DEC-2014' then 1 else 0 end) as "DEC-14",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JAN-2015' then 1 else 0 end) as "JAN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='FEB-2015' then 1 else 0 end) as "FEB-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAR-2015' then 1 else 0 end) as "MAR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='APR-2015' then 1 else 0 end) as "APR-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='MAY-2015' then 1 else 0 end) as "MAY-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUN-2015' then 1 else 0 end) as "JUN-15",
SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='JUL-2015' then 1 else 0 end) as "JUL-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='AUG-2015' then 1 else 0 end) as "AUG-15",
    SUM(CASE WHEN to_char(Audit_Date,'MON-YYYY') ='SEP-2015' then 1 else 0 end) as "SEP-15"
    from dschd.audit_trail aud
    join dschd.release r on r.id=aud.release_id
    join dschd.country cty on aud.EVENT_COUNTRY_ID=cty.id
    join (select  Release_ID, country_id
                 from DSCHD.RELEASE_COUNTRY_RIGHT rcr
                 join dschd.release r on rcr.RELEASE_ID=r.ID
                 join dschd.country cty on rcr.COUNTRY_ID=cty.id
                 where r.release_status in ('DRAFT', 'SCHEDULED', 'FINAL', 'DELIVERED')
                 and r.is_active = 'Y'
                 and rcr.MARKETING_RIGHT = 'Y'
                 and rcr.OPT_OUT = 'N'
                 and r.creation_source = 'DSCHED') Z
       ON aud.Release_ID = z.Realease_ID and
          aud.Event_country_id = z.country_id
    where aud.event_description like '% opted in'
GROUP BY cty.COUNTRY_name