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drop table if exists handicaps cascade; create table handicaps (id int, hcpval decimal, yacht_id int); insert into handicaps values (1, 0.9 , 1), (2, 0.75 , 2), (3, 0.84 , 1), (4, 0.71 , 2), (5, 0.88 , 1), (6, 0.73 , 2), (7, 0.81 , 1), (8, 0.7 , 2); select yacht_id, hcpval, row_number() over (partition by yacht_id order by id desc) as rn from handicaps order by yacht_id, rn; select yacht_id, avg(hcpval) as hcpval from ( select yacht_id, hcpval, row_number() over (partition by yacht_id order by id desc) as rn from handicaps ) t where rn <= 3 group by yacht_id order by yacht_id;
absolute service time: 0,54 sec
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yacht_id
hcpval
rn
1
1
0,8100
1
2
1
0,8800
2
3
1
0,8400
3
4
1
0,9000
4
5
2
0,7000
1
6
2
0,7300
2
7
2
0,7100
3
8
2
0,7500
4
yacht_id
hcpval
1
1
0,84333333333333333333
2
2
0,71333333333333333333