Return the most recent line with analytics

Hi all

Let's say I have this kind of 2 tables:

(People) CREATE TABLE

ID NUMBER,

name VARCHAR2 (128));

INSERT INTO persons VALUES (1, 'Ted');

INSERT INTO persons VALUES (2, 'John');

(Grade) CREATE TABLE

people_id NUMBER,

title VARCHAR2 (128).

START_DATE DATE);

INSERT INTO rank VALUES (1, 'Private', to_date('03-09-1980','DD-MM-YYYY'));

INSERT INTO rank VALUES (1, 'First Class', to_date('25-03-1982','DD-MM-YYYY'));

INSERT INTO rank VALUES (1, 'Sergeant', to_date('22-08-1989','DD-MM-YYYY'));

INSERT INTO rank VALUES (2, 'Sergeant', to_date('07-09-1987','DD-MM-YYYY'));

INSERT INTO rank VALUES (2, 'Lieutenant', to_date('17-05-1995','DD-MM-YYYY'));

What would be the way smart to find the last year of all the people?

Now, I would do something like this:

WITH tmp AS)

SELECT

people_id

title

DENSE_RANK() over (PARTITION BY people_id ORDER BY start_date DESC) history

GRADE

)

SELECT

People.Name, tmp.title

Of

LEFT JOIN tmp WE the people (people.id = tmp.people_id AND tmp.history = 1)

;

Result:

NAMETITLE

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

TedSergeant
JohnLieutenant

Is there a smarter way to do it?

In particular, is there a way to return only the most recent (or older) line a table? (I tried the FIRST clause without success...)

Thank you!!

It will work for your example. More generally you would probably group by id and then just drag the columns id that show you (in case you had two Teds, for example)

SELECT title of the Dungeon (dense_rank last order by start_date) p.name, max (title)

class g

join in-house people p on g.people_id = p.id

Group p.name;

Tags: Database

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