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WITH tableA AS ( SELECT 1 AS id, 34 AS value UNION ALL SELECT 2, 42 UNION ALL SELECT 3, 60 ), tableB AS ( SELECT 1 AS id, 20 AS value, 1 AS tableA_id UNION ALL SELECT 2, 31, 1 UNION ALL SELECT 3, 50, 2 ) SELECT a.id AS tableA_id, a.value AS tableA_value, b.value AS tableB_value FROM tableA a LEFT JOIN ( SELECT *, COUNT(*) OVER (PARTITION BY tableA_id) cnt FROM tableB ) b ON a.id = b.tableA_id AND b.cnt = 1 ORDER BY a.id;
tableA_id
tableA_value
tableB_value
1
34
null
2
42
50
3
60
null