The function of " distinct on"
A B C D
1 1 2 3
1 1 2 4
1 1 2 5
select distinct on (A,B,C) A,D,C,D from hoo order by A,B,C,D
output
A B C D
1 1 2 3
select distinct on (A,B,C) A,D,C,D from hoo order by A,B,C,D desc;
A B C D
1 1 2 5
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转载自flyqantas.iteye.com/blog/2284963
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