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WITH tab1 AS ( SELECT 'A' AS id UNION ALL SELECT 'B' UNION ALL SELECT 'C' UNION ALL SELECT 'D' ), tab2 AS ( SELECT 'A' AS "in", 'B' AS out UNION ALL SELECT 'A', 'B' UNION ALL SELECT NULL, 'C' UNION ALL SELECT 'D', NULL UNION ALL SELECT NULL, NULL UNION ALL SELECT NULL, 'D' UNION ALL SELECT 'C', NULL ) SELECT t1.id, COALESCE(t2.countIN, 0) AS countIN, COALESCE(t3.countOUT, 0) AS countOUT FROM tab1 t1 LEFT JOIN ( SELECT "in", COUNT(*) AS countIN FROM tab2 GROUP BY "in" ) t2 ON t1.id = t2."in" LEFT JOIN ( SELECT out, COUNT(*) AS countOUT FROM tab2 GROUP BY out ) t3 ON t1.id = t3.out ORDER BY t1.id;
id
countin
countout
A
2
0
B
0
2
C
1
1
D
1
1