Return max date records before the start date

Hello

Can anyone help please?

I have two subqueries, a tableofchildren called, the other called tableofworkers. Tableofchildren identifies the date the child started a class.

The second query, Tableofworkers, lists the workers and their history of involvement with the child. A child may have had a history with several workers. The worker has an allocatedstartdate indicating when they began to work with the child.

For my purpose, I need to return the workername and the allocatedstartdate of the worker involved with the child more recently before or at the time when the child began the course.

I have partially accomplished this with the query below. However, due to the quality of the data, the child may not always have an affected worker (allocatedstartdate) earlier or equal to the start date for the course of the child. In this case, the query fails and does not return the child record, that it excludes from the dataset.

Can anyone suggest a way to modify this query, so it acts like a left outer query and returns all the records in the child and null raising where they have no worker allocated beginning before or on the date of start of course?

Thank you! :)

select *
 from
(
select tc.childid, 
tc.childname, 
tc.enteredcourse, 
tw.workername, 
tw.allocatedstartdate, 
row_number() over ( partition by tc.childid, tc.enteredcourse order by tw.allocatedstartdate desc) rn
from tableofchildren tc, tableofworkers tw
where tc.childid = tw.childid(+)
and tc.enteredcourse >= nvl(tw.allocatedstartdate,add_months(sysdate,-10000))
)
where rn = 1

desired output

CHILDID CHILDNAME            ENTEREDCOURSEDATE         WORKERNAME           ALLOCATEDSTARTDATE        
------- -------------------- ------------------------- -------------------- ------------------------- 
C1000   Johnny Rotten        01-APR-11                 Mrs Gerbil           19-AUG-10                 
C1256   Doris Dingle         12-AUG-03                 Mrs Pepsi            12-AUG-03                 
C3466   Bonny Boy            25-MAR-11                 Mrs Jones            23-FEB-11                 
C4567   Casper Ghost         21-MAR-09                                                                
C1245   Doris Dingle         20-NOV-06

create the table tableofchildren
(ChildID varchar (6))
ChildName varchar (20),
Date of EnteredCourse,
Date of LeftCourse);

insert into tableofchildren (ChildName, EnteredCourse, ChildID, LeftCourse) values ("C1000", "Johnny Rotten', to_date (' 01/04/2011 ',' dd/mm/rrrr'), to_date (' 23/05/2011 ',' dd/mm/rrrr'));
insert into tableofchildren (ChildName, EnteredCourse, ChildID, LeftCourse) values ('C1256', 'Doris Dingle', to_date (' 12/08/2003 ',' dd/mm/rrrr'), to_date (' 16/09/2005 ',' dd/mm/rrrr'));
insert into tableofchildren (ChildName, EnteredCourse, ChildID, LeftCourse) values ('C3466","Bonny Boy', to_date (' 25/03/2011 ',' dd/mm/rrrr'), to_date (' 28/03/2011 ',' dd/mm/rrrr'));
insert into tableofchildren (ChildName, EnteredCourse, ChildID, LeftCourse) values ('C4567', 'Ghost Casper', to_date (' 21/03/2009 ',' dd/mm/rrrr'), to_date('22/04/2010','dd/mm/rrrr'));
insert into tableofchildren (ChildName, EnteredCourse, ChildID, LeftCourse) values ('C1245', 'Doris Dingle', to_date (' 20/11/2006 ',' dd/mm/rrrr'), to_date (' 30/12/2008 ',' dd/mm/rrrr'));

create the table tableofworkers
(WorkerID, varchar (6))
WorkerName varchar (20),
Date of AllocatedStartDate,
Date of AllocatedEndDate,
ChildID varchar (6));

insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3453', 'Ms. Whatever", to_date('12/05/2009','dd/mm/rrrr'), to_date ('2009-06-13', ' dd/mm/rrrr'),"C1000");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3442', 'Mr. Toad', to_date('14/07/2010','dd/mm/rrrr'), to_date (' 18/08/2010 ',' dd/mm/rrrr'), "C1000");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W14592', "Mrs gerbil', to_date (' 08/19/2010 ',' dd/mm/rrrr'), NULL,"C1000");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3442', 'Ms. Pepsi", to_date('12/08/2003','dd/mm/rrrr'), to_date (' 22/04/2007 ',' dd/mm/rrrr'),"C1256");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3490', 'Mr. tomato' to_date('12/03/2008','dd/mm/rrrr'), to_date (' 04/30/2009 ',' dd/mm/rrrr'), "C3466");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3453', 'Ms. Whatever", to_date('01/06/2009','dd/mm/rrrr'), to_date ('2010-04-30', ' mm/dd/rrrr'),"C3466");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3457', "Mrs Jones", to_date('23/02/2011','dd/mm/rrrr'), null, "C3466");
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W3453', 'Ms. Jobsworth", to_date('22/11/2006','dd/mm/rrrr'), null, 'C1245');

create the table OutputWanted
(ChildID varchar (6))
ChildName varchar (20),
Date of EnteredCourseDate,
WorkerName varchar (20),
Date of AllocatedStartDate);

insert into OutputWanted (ChildID ChildName, EnteredCourseDate, WorkerName, AllocatedStartDate) values ("C1000", "Johnny Rotten', to_date (' 01/04/2011 ',' dd/mm/rrrr'),"Mrs gerbil", to_date('19/08/2010','dd/mm/rrrr'));
insert into OutputWanted (ChildID ChildName, EnteredCourseDate, WorkerName, AllocatedStartDate) values ('C1256', 'Doris Dingle', to_date (' 12/08/2003 ',' dd/mm/rrrr'), "Ms. Pepsi", to_date('12/08/2003','dd/mm/rrrr'));
insert into OutputWanted (ChildID ChildName, EnteredCourseDate, WorkerName, AllocatedStartDate) values ('C3466","Bonny Boy', to_date (' 25/03/2011 ',' dd/mm/rrrr'), "Mrs. Jones", to_date('23/02/2011','dd/mm/rrrr'));
insert into OutputWanted (ChildID ChildName, EnteredCourseDate, WorkerName, AllocatedStartDate) values ('C4567', 'Casper the ghost', to_date (' 21/03/2009 ',' dd/mm/rrrr'), null, null);
insert into OutputWanted (ChildID ChildName, EnteredCourseDate, WorkerName, AllocatedStartDate) values ('C1245', 'Doris Dingle', to_date (' 20/11/2006 ',' dd/mm/rrrr'), null, null);

Published by: little Penguin November 21, 2011 07:03

What something like that?

SELECT childid
     , childname
     , enteredcourse
     , workername
     , allocatedstartdate
FROM
(
     SELECT toc.childid
          , toc.childname
          , toc.enteredcourse
          , tow.workername
          , tow.allocatedstartdate
          , ROW_NUMBER() OVER (PARTITION BY toc.childid ORDER BY tow.allocatedstartdate DESC) AS rn
     FROM   tableofchildren   toc
     LEFT JOIN tableofworkers tow ON tow.childid = toc.childid
                     AND toc.enteredcourse >= tow.allocatedstartdate
)
WHERE rn = 1

Just note that you need a different RANK and DENSE_RANK analytical ranking function if there is a chance that many workers could be attributed to the children on the same allocatedstartdate.

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insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W5982', 'Sir trout', to_date('22/03/2009','dd/mm/rrrr'), to_date (' 25/05/2009 ',' dd/mm/rrrr'), 'C1245');
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W4587', 'Mrs. crab', to_date('26/05/2009','dd/mm/rrrr'), to_date (' 25/09/2010 ',' dd/mm/rrrr'), 'C1245');
insert into tableofworkers (WorkerID, WorkerName, AllocatedStartDate, AllocatedEndDate, ChildID) values ('W5982', 'Mr. Fishead", to_date('22/11/2010','dd/mm/rrrr'), null, 'C1245');

create table Output1
(ChildID varchar (6))
ChildName varchar (20),
Date of EnteredCourseDate,
Date of CurrWorkerDate,
CurrWorker varchar (20),
Date of PAWDate,
PAWorker varchar (20),
Date of POWDate,
POWorker varchar (20),
LastDate date,
LastWorker varchar (20),
Number of LastWorkerLen);

Connect the output 1 (ChildID ChildName, EnteredCourseDate, CurrWorkerDate, CurrWorker, PAWDate, PAWorker, POWDate, POWorker, LastDate, LastWorker, LastWorkerLen)
values ('C1245', 'Doris Dingle' to_date('23/03/2009','dd/mm/rrrr'), to_date ('2009-03-22', ' dd/mm/rrrr'), 'Mr. trout', to_date('01/03/2009','dd/mm/rrrr'), 'Ms. Octopus', to_date('26/05/2009','dd/mm/rrrr'), 'Mrs. crab', to_date('26/05/2009','dd/mm/rrrr'), 'Mrs. crab", 15)

Hello

Looks like you already know how to get information about paw and pow separately.
The curr and information on the latter is actually more simple: just look for work that has been active on the date of enteredcourse or leftcourse.
Collect all 4 items is the trickiest part. Do an outer join of tableofchildren with each of the 4 separate result sets. Conditions corresponding to your 'rn = 1"must be part of the join condition, as information may be absent for a child.

WITH     curr     AS
(
     SELECT     c_curr.childid
     ,     w_curr.allocatedstartdate     AS currworkerdate
     ,     w_curr.workername          AS currworker
     FROM     tableofchildren          c_curr
     JOIN     tableofworkers          w_curr     ON   c_curr.childid          = w_curr.childid
                              AND  c_curr.enteredcourse       BETWEEN     w_curr.allocatedstartdate
                                                       AND     w_curr.allocatedenddate
)
,     paw     AS
(
     SELECT  c_paw.childid
     ,     w_paw.allocatedstartdate                    AS pawdate
     ,     w_paw.workername                         AS pawworker
     ,     ROW_NUMBER () OVER ( PARTITION BY  c_paw.childid
                               ORDER BY          w_paw.allocatedstartdate     DESC
                             )                         AS paw_rn
     FROM     tableofchildren        c_paw
     JOIN     tableofworkers        w_paw     ON   c_paw.childid          = w_paw.childid
                                 AND  c_paw.enteredcourse     > w_paw.allocatedenddate
)
,     pow     AS
(
     SELECT  c_pow.childid
     ,     w_pow.allocatedstartdate                    AS powdate
     ,     w_pow.workername                         AS powworker
     ,     ROW_NUMBER () OVER ( PARTITION BY  c_pow.childid
                               ORDER BY          w_pow.allocatedstartdate
                             )                         AS pow_rn
     FROM     tableofchildren        c_pow
     JOIN     tableofworkers        w_pow     ON   c_pow.childid          = w_pow.childid
                                 AND  c_pow.enteredcourse     < w_pow.allocatedstartdate
)
,     lst     AS
(
     SELECT  c_lst.childid
     ,     w_lst.allocatedstartdate                    AS lastdate
     ,     w_lst.workername                         AS lastworker
     ,     FLOOR ( MONTHS_BETWEEN ( c_lst.leftcourse
                                 , w_lst.allocatedstartdate
                           )
                )                                   AS lastworkerlen
     FROM     tableofchildren        c_lst
     JOIN     tableofworkers        w_lst     ON   c_lst.childid     = w_lst.childid
                                 AND  c_lst.leftcourse     BETWEEN w_lst.allocatedstartdate
                                                  AND     w_lst.allocatedenddate
)
SELECT       c.childid
,       c.childname
,       c.enteredcourse     AS enteredcoursedate
,       curr.currworkerdate
,       curr.currworker
,       paw.pawdate
,       paw.pawworker
,       pow.powdate
,       pow.powworker
,       lst.lastdate
,       lst.lastworker
,       lst.lastworkerlen
FROM       tableofchildren     c
LEFT OUTER JOIN                curr     ON   curr.childid     = c.childid
LEFT OUTER JOIN               paw     ON   paw.childid     = c.childid
                                 AND  paw.paw_rn          = 1
LEFT OUTER JOIN               pow     ON   pow.childid     = c.childid
                                 AND  pow.pow_rn          = 1
LEFT OUTER JOIN               lst     ON   lst.childid     = c.childid
;

How to get the different records for the date max.

Hi all
Here is the sample sql for sample table and data.

Create table student (dept_id number(10), first_name varchar2(10),last_name varchar2(10),join_date date,years_attended number(10)); insert into student values (1,'Ann','Coleman',to_date('3/7/1917','MM/DD/YYYY'),4); insert into student values (1,'Ann','Coleman',to_date('3/7/1916','MM/DD/YYYY'),5); insert into student values (2,'Rock','Star',to_date('1/1/1920','MM/DD/YYYY'),5); insert into student values (2,'Rock','Star',to_date('1/1/1921','MM/DD/YYYY'),6); insert into student values (3,'Jack','Smith',to_date('7/1/1900','MM/DD/YYYY'),3);

insert into student values (3,'Jack','Smith',to_date('7/1/1901','MM/DD/YYYY'),4);

commit;

I need to get maximum date records when the name and dep_id corresponds to. I wrote the query below and it becomes the expected result, but I'm not sure it's quite effective.

SELECT s.dept_id, s.first_name,s.years_attended

FROM (SELECT dept, MAX (join_date) join_date

STUDENT GROUP BY dept_id) x

Student JOIN s ON x.dept_id = s.dept_id AND x.join_date = s.join_date;

This above query returns records like below, and this is the goal.

DEPT_ID NAME YEARS_ATTENDED

1                         Ann                                4

2                         Rock                              6

3                         Jack                              4

Can you please let me know the query SQL I wrote is effective or not? This sample table may have less data, but I'm dealing with millions of records.

Hello

Thanks for posting CREATE TABLE and INSERT statement. This really helps.

Here's a solution. I also added a name that seems logical. In which case you can delete:

Select dept_id, first_name, last_name

, max (years_attended) Dungeon years_attended (last dense_rank order by join_date)

the student

Group of dept_id, first_name, last_name;

DEPT_ID FIRST_NAME LAST_NAME YEARS_ATTENDED

---------- ---------- ---------- --------------

1 Ann Coleman 4

Rock 2 star 6

3 Jack Smith 4

Kind regards.

Alberto

Return max date records before the start date

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