我有一个包含以下列的表
select a.ssrmeet_crn
,a.ssrmeet_begin_time
,a.ssrmeet_end_time
,a.ssrmeet_start_date
,a.ssrmeet_end_date
,a.ssrmeet_sun_day
,a.ssrmeet_mon_day
,a.ssrmeet_tue_day
,a.ssrmeet_wed_day
,a.ssrmeet_thu_day
,a.ssrmeet_fri_day
,a.ssrmeet_sat_day
from ssrmeet a
where a.ssrmeet_term_code = 201730
and a.ssrmeet_crn = 32789
一个类的行看起来像这样
SSRMEET_CRN SSRMEET_BEGIN_TIME SSRMEET_END_TIME SSRMEET_START_DATE SSRMEET_END_DATE SSRMEET_SUN_DAY SSRMEET_MON_DAY SSRMEET_TUE_DAY SSRMEET_WED_DAY SSRMEET_THU_DAY SSRMEET_FRI_DAY SSRMEET_SAT_DAY
32789 1000 1050 1/8/2018 12:00:00 AM 5/4/2018 12:00:00 AM M W F
我需要它列出每个类别的会议
CRN START_DATE END_DATE
32789 1/15/2018 10:00:00 AM 1/15/2018 10:50:00 AM
32789 1/22/2018 10:00:00 AM 1/22/2018 10:50:00 AM
32789 1/29/2018 10:00:00 AM 1/29/2018 10:50:00 AM
32789 2/05/2018 10:00:00 AM 2/05/2018 10:50:00 AM
32789 2/12/2018 10:00:00 AM 2/12/2018 10:50:00 AM
32789 2/19/2018 10:00:00 AM 2/19/2018 10:50:00 AM
32789 2/26/2018 10:00:00 AM 2/26/2018 10:50:00 AM
32789 3/05/2018 10:00:00 AM 3/05/2018 10:50:00 AM
32789 3/12/2018 10:00:00 AM 3/12/2018 10:50:00 AM
32789 3/19/2018 10:00:00 AM 3/19/2018 10:50:00 AM
32789 3/26/2018 10:00:00 AM 3/26/2018 10:50:00 AM
32789 4/02/2018 10:00:00 AM 4/02/2018 10:50:00 AM
32789 4/09/2018 10:00:00 AM 4/09/2018 10:50:00 AM
32789 3/16/2018 10:00:00 AM 3/16/2018 10:50:00 AM
32789 4/23/2018 10:00:00 AM 4/23/2018 10:50:00 AM
32789 4/30/2018 10:00:00 AM 4/30/2018 10:50:00 AM
32789 1/10/2018 10:00:00 AM 1/10/2018 10:50:00 AM
32789 1/17/2018 10:00:00 AM 1/17/2018 10:50:00 AM
32789 1/24/2018 10:00:00 AM 1/24/2018 10:50:00 AM
32789 1/31/2018 10:00:00 AM 1/31/2018 10:50:00 AM
32789 2/07/2018 10:00:00 AM 2/07/2018 10:50:00 AM
32789 2/14/2018 10:00:00 AM 2/14/2018 10:50:00 AM
32789 2/21/2018 10:00:00 AM 2/21/2018 10:50:00 AM
2789 2/28/2018 10:00:00 AM 2/28/2018 10:50:00 AM
32789 3/07/2018 10:00:00 AM 3/07/2018 10:50:00 AM
32789 3/14/2018 10:00:00 AM 3/14/2018 10:50:00 AM
32789 3/21/2018 10:00:00 AM 3/21/2018 10:50:00 AM
32789 3/28/2018 10:00:00 AM 3/28/2018 10:50:00 AM
32789 4/04/2018 10:00:00 AM 4/04/2018 10:50:00 AM
32789 4/11/2018 10:00:00 AM 4/11/2018 10:50:00 AM
32789 4/18/2018 10:00:00 AM 4/18/2018 10:50:00 AM
32789 4/25/2018 10:00:00 AM 4/25/2018 10:50:00 AM
32789 5/02/2018 10:00:00 AM 5/02/2018 10:50:00 AM
32789 1/12/2018 10:00:00 AM 1/12/2018 10:50:00 AM
32789 1/19/2018 10:00:00 AM 1/19/2018 10:50:00 AM
32789 1/26/2018 10:00:00 AM 1/26/2018 10:50:00 AM
32789 2/02/2018 10:00:00 AM 2/02/2018 10:50:00 AM
32789 2/09/2018 10:00:00 AM 2/09/2018 10:50:00 AM
32789 2/16/2018 10:00:00 AM 2/16/2018 10:50:00 AM
32789 2/23/2018 10:00:00 AM 2/23/2018 10:50:00 AM
32789 3/02/2018 10:00:00 AM 3/02/2018 10:50:00 AM
32789 3/09/2018 10:00:00 AM 3/09/2018 10:50:00 AM
32789 3/16/2018 10:00:00 AM 3/16/2018 10:50:00 AM
32789 3/23/2018 10:00:00 AM 3/23/2018 10:50:00 AM
32789 3/30/2018 10:00:00 AM 3/30/2018 10:50:00 AM
32789 4/06/2018 10:00:00 AM 4/06/2018 10:50:00 AM
32789 4/13/2018 10:00:00 AM 4/13/2018 10:50:00 AM
32789 4/20/2018 10:00:00 AM 4/20/2018 10:50:00 AM
32789 4/27/2018 10:00:00 AM 4/27/2018 10:50:00 AM
32789 5/04/2018 10:00:00 AM 5/04/2018 10:50:00 AM
如果课程在当天开会，那么日期栏目只有指标。 （周日＆＃39; U＆＃39;， 星期一＆＃39; M＆＃39;， 星期二＆＃39; T＆＃39;， 星期三＆＃39; W＆＃39;， 星期四＆＃39; R＆＃39;， 星期五＆＃39; F＆＃39;， 周六＆＃39; S＆＃39;）
，开始时间和结束时间为24小时格式。
我已经尝试了几种不同的尝试和解决方法，包括使用连接，但我很难过。
据我所知。我可以用它生成第一个日期，但我不知道从哪里开始..
with
data_prep as(
select 'U' dotw_code, 'Sunday' week_day from dual
union all
select 'M', 'Monday' from dual
union all
select 'T', 'Tuesday' from dual
union all
select 'W', 'Wednesday' from dual
union all
select 'R', 'Thursday' from dual
union all
select 'F', 'Friday' from dual
union all
select 'S', 'Saturday' from dual
)
select a.ssrmeet_crn crn
,case b.dotw_code
when 'U'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'SUN')
when 'M'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'MON')
when 'T'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'TUE')
when 'W'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'WED')
when 'R'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'THU')
when 'F'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'FRI')
when 'S'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_begin_time, 'MM/DD/YYYY HH24:MI:SS'),'SAT')
end start_date
,case b.dotw_code
when 'U'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'SUN')
when 'M'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'MON')
when 'T'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'TUE')
when 'W'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'WED')
when 'R'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'THU')
when 'F'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'FRI')
when 'S'
then
next_day(to_date(to_char(ssrmeet_start_date, 'MM/DD/YYYY') || ' ' || ssrmeet_end_time, 'MM/DD/YYYY HH24:MI:SS'),'SAT')
end end_date
from ssrmeet a
left join data_prep b
on a.ssrmeet_sun_day = b.dotw_code
or a.ssrmeet_mon_day = b.dotw_code
or a.ssrmeet_tue_day = b.dotw_code
or a.ssrmeet_wed_day = b.dotw_code
or a.ssrmeet_thu_day = b.dotw_code
or a.ssrmeet_fri_day = b.dotw_code
or a.ssrmeet_sat_day = b.dotw_code
where ssrmeet_term_code = 201730
and ssrmeet_crn = 32789
如果有人可以帮助甚至指点如何在论坛上正确格式化我的问题，我会非常感激。
答案 0 :(得分：1)
如果我理解正确（您希望列出会议应该在开始日期和结束日期之间发生的日期），那么我认为以下查询应该适合您：
WITH ssrmeet AS (SELECT 32789 ssrmeet_crn, 201730 ssrmeet_term_code, to_date('01/03/2017', 'dd/mm/yyyy') ssrmeet_start_date, to_date('01/04/2017', 'dd/mm/yyyy') ssrmeet_end_date, NULL sun_day, NULL mon_day, 'T' tue_day, 'W' wed_day, NULL thu_day, 'F' fri_day, 'S' sat_day FROM dual UNION ALL
SELECT 32790 ssrmeet_crn, 201730 ssrmeet_term_code, to_date('05/03/2017', 'dd/mm/yyyy') ssrmeet_start_date, to_date('27/03/2017', 'dd/mm/yyyy') ssrmeet_end_date, NULL sun_day, NULL mon_day, 'T' tue_day, 'W' wed_day, NULL thu_day, 'F' fri_day, 'S' sat_day FROM dual)
SELECT ssrmeet_crn,
ssrmeet_start_date,
ssrmeet_end_date,
dt,
to_char(dt, 'Dy', 'nls_date_language = english') dt_day,
CASE WHEN (to_char(dt, 'Dy', 'nls_date_language = english') = 'Mon' AND mon_day = 'M')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Tue' AND tue_day = 'T')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Wed' AND wed_day = 'W')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Thu' AND thu_day = 'R')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Fri' AND fri_day = 'F')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Sat' AND sat_day = 'S')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Sun' AND sun_day = 'U')
THEN dt
END meet_dt
FROM (SELECT ssrmeet_crn,
ssrmeet_start_date,
ssrmeet_end_date,
ssrmeet_start_date - 1 + LEVEL dt,
sun_day,
mon_day,
tue_day,
wed_day,
thu_day,
fri_day,
sat_day
FROM ssrmeet
CONNECT BY ssrmeet_crn = PRIOR ssrmeet_crn
AND ssrmeet_term_code = PRIOR ssrmeet_term_code
AND PRIOR sys_guid() IS NOT NULL
AND LEVEL <= ssrmeet_end_date - ssrmeet_start_date + 1)
WHERE CASE WHEN (to_char(dt, 'Dy', 'nls_date_language = english') = 'Mon' AND mon_day = 'M')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Tue' AND tue_day = 'T')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Wed' AND wed_day = 'W')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Thu' AND thu_day = 'R')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Fri' AND fri_day = 'F')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Sat' AND sat_day = 'S')
OR (to_char(dt, 'Dy', 'nls_date_language = english') = 'Sun' AND sun_day = 'U')
THEN dt
END IS NOT NULL
ORDER BY ssrmeet_crn,
ssrmeet_start_date,
dt;
SSRMEET_CRN SSRMEET_START_DATE SSRMEET_END_DATE DT DT_DAY MEET_DT
----------- ------------------ ---------------- ----------- ------ -----------
32789 01/03/2017 01/04/2017 01/03/2017 Wed 01/03/2017
32789 01/03/2017 01/04/2017 03/03/2017 Fri 03/03/2017
32789 01/03/2017 01/04/2017 04/03/2017 Sat 04/03/2017
32789 01/03/2017 01/04/2017 07/03/2017 Tue 07/03/2017
32789 01/03/2017 01/04/2017 08/03/2017 Wed 08/03/2017
32789 01/03/2017 01/04/2017 10/03/2017 Fri 10/03/2017
32789 01/03/2017 01/04/2017 11/03/2017 Sat 11/03/2017
32789 01/03/2017 01/04/2017 14/03/2017 Tue 14/03/2017
32789 01/03/2017 01/04/2017 15/03/2017 Wed 15/03/2017
32789 01/03/2017 01/04/2017 17/03/2017 Fri 17/03/2017
32789 01/03/2017 01/04/2017 18/03/2017 Sat 18/03/2017
32789 01/03/2017 01/04/2017 21/03/2017 Tue 21/03/2017
32789 01/03/2017 01/04/2017 22/03/2017 Wed 22/03/2017
32789 01/03/2017 01/04/2017 24/03/2017 Fri 24/03/2017
32789 01/03/2017 01/04/2017 25/03/2017 Sat 25/03/2017
32789 01/03/2017 01/04/2017 28/03/2017 Tue 28/03/2017
32789 01/03/2017 01/04/2017 29/03/2017 Wed 29/03/2017
32789 01/03/2017 01/04/2017 31/03/2017 Fri 31/03/2017
32789 01/03/2017 01/04/2017 01/04/2017 Sat 01/04/2017
32790 05/03/2017 27/03/2017 07/03/2017 Tue 07/03/2017
32790 05/03/2017 27/03/2017 08/03/2017 Wed 08/03/2017
32790 05/03/2017 27/03/2017 10/03/2017 Fri 10/03/2017
32790 05/03/2017 27/03/2017 11/03/2017 Sat 11/03/2017
32790 05/03/2017 27/03/2017 14/03/2017 Tue 14/03/2017
32790 05/03/2017 27/03/2017 15/03/2017 Wed 15/03/2017
32790 05/03/2017 27/03/2017 17/03/2017 Fri 17/03/2017
32790 05/03/2017 27/03/2017 18/03/2017 Sat 18/03/2017
32790 05/03/2017 27/03/2017 21/03/2017 Tue 21/03/2017
32790 05/03/2017 27/03/2017 22/03/2017 Wed 22/03/2017
32790 05/03/2017 27/03/2017 24/03/2017 Fri 24/03/2017
32790 05/03/2017 27/03/2017 25/03/2017 Sat 25/03/2017
首先执行分层查询，为开始日期和结束日期之间的每个日期生成一行（添加1以在结果中包含start_date）。如果有多行，这将为每一行生成分层查询。如果您只希望一次为一行执行此操作，则只需要connect by子句中的最后一行（前三行是为每行创建层次结构所必需的，而不是跨越行集.I假设ssrmeet_term_code，ssrmeet_crn是唯一的。）
获得此列表后，您可以检查日期标记以查看日期是否为标记日期之一，如果不是，则不要输出日期。 （N.B.因为你没有提供任何样本数据或预期输出，所以我不得不猜测表内容和预期输出。）
如果你有可能改变设计，我会在日标志列中使用简单的Y / N（或Y / null），而不是每列都有自己的标志（即mon_flag = Y，tue_flag = Y等，而不是mon_flag =＆＃39; M＆＃39;，tue_flag =＆＃39; T＆＃39;等等）