Filtering rows based on the value of the field
HelloI have something like this:
create table stuff
(
Avalue varchar2,
anothervalue varchar2,
thirdValue varchar2,
aNumber number
)
INSERT INTO stuff Values ('abc', 'cde', efg', 2);
INSERT INTO stuff Values ('abc', 'cde', efgggg', 4);
INSERT INTO stuff Values ('abc', 'xxx', efg', 1);
INSERT INTO stuff Values ('abc', 'xxx', efgxxx', 2);
INSERT INTO stuff Values ('abc', 'yyy', efg', 2);
I would like to receive the lines with the most "anumber" - value, grouped by "value" and "anothervalue" (but not "thirdvalue"). So, in this example, I want to rank 2, 4 and 5.
Someone has an idea? I think that a 'order by desc"isn't the best way here?
select avalue,
anothervalue,
thirdvalue,
anumber
from (
select s.*,
rank() over(partition by avalue,anothervalue order by anumber desc) rnk
from stuff s
)
where rnk = 1
/
AVALUE ANOTHERVAL THIRDVALUE ANUMBER
---------- ---------- ---------- ----------
abc cde efgggg 4
abc xxx efgxxx 2
abc yyy efg 2
SQL>
SY.
Tags: Database
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