合併日期範圍

Question

Oracle SQL新手在這裏和第一次張貼海報。

我認爲這將是簡單的，直到我意識到我無法弄清楚如何分割返回分配。

這裏是我的作業表：ASGN

ID ST_DT  END_DT  POS LOCN STATUS WAGE_CD 
-- ---------- ---------- ----- ---- ------ ------- 
A 12-31-2006 08-16-2009 CLERK LAX 3  A 
A 08-17-2009 10-04-2009 CLERK LAX 0  Z 
A 10-05-2009 06-30-2010 OPR NYC 3  A 
A 07-01-2010 12-31-2010 OPR NYC 3  B 
A 01-01-2011 06-30-2012 OPR NYC 3  C 
A 07-01-2012 04-09-2013 OPR NYC 3  D 
A 04-10-2013 06-30-2013 CLERK LAX 3  A 
A 07-01-2013 08-10-2014 CLERK LAX 3  B 
A 07-01-2013 08-10-2014 CLERK LAX 3  C 
B 04-10-2013 05-31-2013 SUP LAX 3  A 
B 06-01-2013 06-30-2014 SUP LAX 0  Z 
B 07-01-2013 08-10-2014 SUP LAX 3  B 
B 08-11-2014 08-11-2014 CLERK NYC 3  A 
B 08-12-2014 01-11-2015 SUP LAX 3  A 
B 01-12-2015 02-10-2016 SUP LAX 3  B 
B 02-11-2016 08-12-2016 OPER SFO 3  A 
B 02-11-2016 08-12-2016 OPER SFO 3  B 

我已經有意想不到的效果試過下面這樣。

SELECT * 
FROM (
    SELECT ID 
     ,MIN(ST_DT) ST_DT 
     ,MAX(END_DT) END_DT 
     ,POS 
     ,LOCN 
     ,STATUS 
    FROM ASGN 
    GROUP BY ID, LOCN, POS, STATUS 
) SUBQRY 
ORDER BY ID, ST_DT 

意外的結果，但有道理。這是返回分配不與以前的分配相結合的地方。

ID ST_DT  END_DT  POS LOCN STATUS 
-- ---------- ---------- ----- ---- ------ 
A 12-31-2006 08-10-2014 CLERK LAX 3 
A 08-17-2009 10-04-2009 CLERK LAX 0 
A 10-05-2009 04-09-2010 OPR NYC 3 
B 04-10-2013 02-10-2015 SUP LAX 3 
B 06-01-2013 06-30-2014 SUP LAX 0 
B 08-11-2014 08-11-2014 CLERK NYC 3 
B 02-11-2016 08-12-2016 OPER SFO 3 

而且看到我想結果在相鄰日期每ID，位置，位置相結合，STATUS：

ID ST_DT  END_DT  POS LOCN STATUS 
-- ---------- ---------- ----- ---- ------ 
A 12-31-2006 08-16-2009 CLERK LAX 3 
A 08-17-2009 10-04-2009 CLERK LAX 0 
A 10-05-2009 04-09-2010 OPR NYC 3 
A 04-10-2013 08-10-2014 CLERK LAX 3 
B 04-10-2013 05-31-2013 SUP LAX 3 
B 06-01-2013 06-30-2014 SUP LAX 0 
B 07-01-2013 08-10-2014 SUP LAX 3 
B 08-11-2014 08-11-2014 CLERK NYC 3 
B 08-12-2014 02-10-2015 SUP LAX 3 
B 02-11-2016 08-12-2016 OPER SFO 3 

我問了一個多賽季的Oracle SQL程序員，他說我我們需要PLSQL，但我認爲必須有一種方法可以通過SQL來完成這項工作。

測試設置腳本：

create table asgn 
(id varchar2(10) 
,st_dt date 
,end_dt date 
,pos varchar2(10) 
,locn varchar2(10) 
,status number 
,wage_cd varchar2(10)); 

insert into asgn values('A',to_date('12-31-2006','mm-dd-yyyy'),to_date('08-16-2009','mm-dd-yyyy'),'CLERK','LAX',3,'A'); 
insert into asgn values('A',to_date('08-17-2009','mm-dd-yyyy'),to_date('10-04-2009','mm-dd-yyyy'),'CLERK','LAX',0,'Z'); 
insert into asgn values('A',to_date('10-05-2009','mm-dd-yyyy'),to_date('06-30-2010','mm-dd-yyyy'),'OPR','NYC',3,'A'); 
insert into asgn values('A',to_date('07-01-2010','mm-dd-yyyy'),to_date('12-31-2010','mm-dd-yyyy'),'OPR','NYC',3,'B'); 
insert into asgn values('A',to_date('01-01-2011','mm-dd-yyyy'),to_date('06-30-2012','mm-dd-yyyy'),'OPR','NYC',3,'C'); 
insert into asgn values('A',to_date('07-01-2012','mm-dd-yyyy'),to_date('04-09-2013','mm-dd-yyyy'),'OPR','NYC',3,'D'); 
insert into asgn values('A',to_date('04-10-2013','mm-dd-yyyy'),to_date('06-30-2013','mm-dd-yyyy'),'CLERK','LAX',3,'A'); 
insert into asgn values('A',to_date('07-01-2013','mm-dd-yyyy'),to_date('08-10-2014','mm-dd-yyyy'),'CLERK','LAX',3,'B'); 
insert into asgn values('A',to_date('07-01-2013','mm-dd-yyyy'),to_date('08-10-2014','mm-dd-yyyy'),'CLERK','LAX',3,'C'); 
insert into asgn values('B',to_date('04-10-2013','mm-dd-yyyy'),to_date('05-31-2013','mm-dd-yyyy'),'SUP','LAX',3,'A'); 
insert into asgn values('B',to_date('06-01-2013','mm-dd-yyyy'),to_date('06-30-2014','mm-dd-yyyy'),'SUP','LAX',0,'Z'); 
insert into asgn values('B',to_date('07-01-2013','mm-dd-yyyy'),to_date('08-10-2014','mm-dd-yyyy'),'SUP','LAX',3,'B'); 
insert into asgn values('B',to_date('08-11-2014','mm-dd-yyyy'),to_date('08-11-2014','mm-dd-yyyy'),'CLERK','NYC',3,'A'); 
insert into asgn values('B',to_date('08-12-2014','mm-dd-yyyy'),to_date('01-11-2015','mm-dd-yyyy'),'SUP','LAX',3,'A'); 
insert into asgn values('B',to_date('01-12-2015','mm-dd-yyyy'),to_date('02-10-2016','mm-dd-yyyy'),'SUP','LAX',3,'B'); 
insert into asgn values('B',to_date('02-11-2016','mm-dd-yyyy'),to_date('08-12-2016','mm-dd-yyyy'),'OPER','SFO',3,'A'); 
insert into asgn values('B',to_date('02-11-2016','mm-dd-yyyy'),to_date('08-12-2016','mm-dd-yyyy'),'OPER','SFO',3,'B'); 

Answer 1

員工A有兩行對2013年7月1日至2014年8月10日;我認爲這是一個錯誤，我刪除了其中的一行。

除此之外，這是「tabibitosan方法」用於解決日期範圍的「間隙和島嶼」問題的應用。訣竅在於創建相鄰區間的「組」（gp）。

with 
    prep (id, st_dt, end_dt, gp, pos, locn, status) as (
     select id, st_dt, end_dt, 
       end_dt - sum(end_dt - st_dt + 1) over (partition by id, pos, locn, status 
                 order by st_dt), 
       pos, locn, status 
     from asgn 
    ) 
select id, min(st_dt) as st_dt, max(end_dt) as end_dt, pos, locn, status 
from prep 
group by id, gp, pos, locn, status 
order by id, st_dt 
; 



ID   ST_DT  END_DT  POS  LOCN   STATUS 
---------- ---------- ---------- ---------- ---------- ---------- 
A   12-31-2006 08-16-2009 CLERK  LAX     3 
A   08-17-2009 10-04-2009 CLERK  LAX     0 
A   10-05-2009 04-09-2013 OPR  NYC     3 
A   04-10-2013 08-10-2014 CLERK  LAX     3 
B   04-10-2013 05-31-2013 SUP  LAX     3 
B   06-01-2013 06-30-2014 SUP  LAX     0 
B   07-01-2013 08-10-2014 SUP  LAX     3 
B   08-11-2014 08-11-2014 CLERK  NYC     3 
B   08-12-2014 02-10-2016 SUP  LAX     3 
B   02-11-2016 08-12-2016 OPER  SFO     3 

10 rows selected