Question

我正在尝试使用select脚本从数据库中的表中提取工作日列。划分＆＃34; MWF＆＃34;进入＆＃34;星期一＆＃34;，＆＃34;星期三＆＃34;和＆＃34;星期五＆＃34;。每天需要在一行中显示。

我在这里有：

SELECT
    REGEXP_SUBSTR(MEETING_DAY, '[^,]+', 1, LEVEL, 'i'), FROM_TIME_HHIIAP  as DAY 
FROM
    (SELECT
        CASE WHEN (DAY_MEET.MEETING_DAYS = 'F')THEN ('Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'FS')THEN ('Friday,Saturday')
             WHEN (DAY_MEET.MEETING_DAYS = 'M')THEN ('Monday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MF')THEN ('Monday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MT')THEN ('Monday,Tuesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MTH')THEN ('Monday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MTTH')THEN ('Monday,Tuesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MTW')THEN ('Monday,Tuesday,Wednesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MTWTH')THEN ('Monday,Tuesday,Wednesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MTWTHF')THEN ('Monday,Tuesday,Wednesday,Thursday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MW')THEN ('Monday,Wednesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MWF')THEN ('Monday,Wednesday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'MWTH')THEN ('Monday,Wednesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'S')THEN ('Saturday')
             WHEN (DAY_MEET.MEETING_DAYS = 'T')THEN ('Tuesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'TH')THEN ('Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'THF')THEN ('Thursday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'TTH')THEN ('Tuesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'TTHF') THEN  ('Tuesday,Thursday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'TW')THEN ('Tuesday,Wednesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'TWTH')THEN ('Tuesday,Wednesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'W')THEN ('Wednesday')
             WHEN (DAY_MEET.MEETING_DAYS = 'WF')THEN ('Wednesday,Friday')
             WHEN (DAY_MEET.MEETING_DAYS = 'WTH')THEN ('Wednesday,Thursday')
             WHEN (DAY_MEET.MEETING_DAYS = 'WTHF')THEN ('Wednesday,Thursday,Friday')
             ELSE ('Unknown')
         END MEETING_DAY, 
         DAY_MEET.*
     FROM 
         UTDBA.IS_167_DAY12_MEETING_INFO DAY_MEET)

CONNECT BY LEVEL <=  
           LENGTH(MEETING_DAY) - LENGTH(REGEXP_REPLACE(MEETING_DAY, ',', ''))+1;

但似乎LEVEL停留在第一行之后的最后一个字符，因此结果是错误的。任何人都知道如何刷新Level返回每行的第一个单词？

Answer 1

嗯。您可以使用join：

执行此操作

select mi.*, d.name
from (select mi.*,
             replace(mi.meeting_days, 'TH', 'X') as meeting_days_x -- do something about Thursday
      from UTDBA.IS_167_DAY12_MEETING_INFO mi
     ) mi join
     (select 'M' as abbrev, 'Monday' as name from dual union all
      select 'T' as abbrev, 'Tuesday' as name from dual union all
      select 'W' as abbrev, 'Wednesday' as name from dual union all
      select 'X' as abbrev, 'Thursday' as name from dual union all
      select 'F' as abbrev, 'Friday' as name from dual union all
      select 'S' as abbrev, 'Saturday' as name from dual
     ) d
     on mi.meeting_days_x like '%' || d.abbrev || '%';

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