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CREATE TABLE tbl (id int, a int, b text); INSERT INTO tbl VALUES (1, 1, 'kate'), (1, 4, NULL), (1, 3, 'paul'), (1, 3, 'paul'), (1, 2, 'lola'), (2, 1, 'kim'), (2, 9, NULL), (2, 2, NULL) ;
CREATE TABLE
INSERT 0 8
SELECT DISTINCT ON (id) * FROM tbl WHERE b IS NOT NULL ORDER BY id, a DESC;
id
a
b
1
3
paul
2
1
kim
SELECT 2