Get the updated record the last based on the Date and the van of the user ID corresponding (multiple tables)

Hello people,

I currently have a working for this using PL/SQL solution, but it would be nice to have it using SQL. Any help is appreciated and once again, to your practice time.

I'm looking to pick up the most recent date and the corresponding user that updated registration for a student in particular. There are two tables T1 and T2. The most recent date can be the create_date or modified_date of T1 or T2.

Scripts for creating the table and INSERT statements:

create table T1
  ( code           varchar2(4),
    create_date    date,
    create_userid  varchar2(20),
    modified_date  date,
    modify_userid  varchar2(20));

create table T2
  ( code           varchar2(4),
    visit_id       number,
    visit_date     date,
    create_date    date,
    create_userid  varchar2(20),
    modified_date  date,
    modify_userid  varchar2(20));

insert into T1 values ('1001',to_date('06-FEB-2013 09:12:12','DD-MON-YYYY HH24:Mi:SS'),'ROGER',to_date('12-APR-2013 13:01:12','DD-MON-YYYY HH24:Mi:SS'),'BRIAN');
insert into T2 values ('1001',1,to_date('10-JAN-2013','DD-MON-YYYY'), to_date('10-JAN-2013 14:12:12','DD-MON-YYYY HH24:Mi:SS'),'ROGER',to_date('12-MAR-2013 12:01:06','DD-MON-YYYY HH24:Mi:SS'),'AMY');
insert into T2 values ('1001',2,to_date('31-JAN-2013','DD-MON-YYYY'), to_date('12-MAY-2013 16:11:12','DD-MON-YYYY HH24:Mi:SS'),'GRACIE',null,null);

insert into T1 values ('1002',to_date('12-JAN-2013 11:12:13','DD-MON-YYYY HH24:Mi:SS'),'LYNNELLE',to_date('12-APR-2013 13:01:12','DD-MON-YYYY HH24:Mi:SS'),'BRIAN');
insert into T2 values ('1002',1,to_date('10-JAN-2012','DD-MON-YYYY'), to_date('10-JAN-2012 09:12:12','DD-MON-YYYY HH24:Mi:SS'),'ROGER',to_date('12-APR-2013 13:04:12','DD-MON-YYYY HH24:Mi:SS'),'AMY');
insert into T2 values ('1002',2,to_date('10-JAN-2013','DD-MON-YYYY'), to_date('12-JAN-2013 11:12:13','DD-MON-YYYY HH24:Mi:SS'),'JOHN',null,null);

insert into T1 values ('1003', to_date('04-FEB-2014 12:01:01', 'DD-MON-YYYY HH24:Mi:SS'), 'LYNNELLE', null, null);

I want to show for the three codes are the following records:

Code      Table Date                              User ID
1001      T2  12-MAY-2013 16:11:12   GRACIE
1002      T2 12-APR-2013 13:04:12   AMY
1003 T1 04-FEB-2014 12:01:01 LYNNELLE

1001 students, the most recent is the create_date of the visit count = 2 for the Code 1002, the most recent date comes from modified_date for visit 1 (its 3 seconds later than the T1 modified_date). Finally, for students 1003 (who did not all records in T2, the create_date is the only date and must be picked up.

Thanks in advance.


with t as)

Select the code,

NVL (MODIFIED_DATE, create_date) dt.

case nvl (modified_date, create_date)

When modified_date then modify_userid

of other create_userid

end userid,

Tbl "T1".

from t1

Union of all the

Select the code,

NVL (MODIFIED_DATE, create_date) dt.

case nvl (modified_date, create_date)

When modified_date then modify_userid

of other create_userid

end userid,

Tbl 'T2 '.

the t2


Select the code,

Max (TBL) keep (dense_rank last order by dt, tbl) tbl.

Max (DT) dt,

Max (UserID) keep (dense_rank last order by dt, tbl) userid


Code group

order by code


---- -- -------------------- --------------------
1001 T2 MAY 12, 2013 16:11:12 GRACIE
1002 T2 12 APRIL 2013 13:04:12 AMY
1003 T1 4 FEBRUARY 2014 12:01:01 MANON



Tags: Database

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