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Developer-C 11.1
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CREATE TABLE test (id INT, cat1 CHAR(1), cat2 CHAR(3)); INSERT INTO test VALUES (1,'A','foo'), (2,'A','foo'), (3,'A','bar'), (4,'B','sci'), (5,'B','ble'), (6,'B','ble');
WITH cte AS ( SELECT MIN(id) id, cat1, cat2 FROM test GROUP BY cat1, cat2 ) SELECT t1.id, t1.cat1, t1.cat2, DENSE_RANK() OVER (PARTITION BY t1.cat1 ORDER BY t2.id asc) as res FROM test t1 JOIN cte t2 USING (cat1, cat2) ORDER BY t1.id;
id
cat1
cat2
res
1
A
foo
1
2
A
foo
1
3
A
bar
2
4
B
sci
1
5
B
ble
2
6
B
ble
2