I have a table with fields: id A B C D E F where id is an int4 primary key. In this table there is information like: 1 a1 b1 xxx xxx 2 a1 b1 xxx xxx xxx xxx 3 a2 b2 xxx xxx xxx xxx 4 a2 b2 xxx xxx xxx xxx 5 a3 b3 xxx xxx xxx 6 a3 b3 xxx xxx xxx xxx 7 a3 b3 xxx xxx xxx xxx 8 a4 b4 xxx xxx xxx xxx 9 a1 b1 xxx 10 a3 b3 xxx 11 a1 b3 xxx where xxx represents any information. My problem is: I only want to select one of the records which have the same combination of information in fields A and B, and that should be the record with the lowest id. Thus, the resultset should be: 1 a1 b1 xxx xxx 3 a2 b2 xxx xxx xxx xxx 5 a3 b3 xxx xxx xxx 8 a4 b4 xxx xxx xxx xxx 11 a1 b3 xxx Importantly, I might not want the selected records listed in order of increasing id. They might be sorted according to the data in e.g. the C field.
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