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WITH quarters AS ( SELECT 2020 AS year, 1 AS quarter, '2020Q1' AS label UNION ALL SELECT 2020, 2, '2020Q2' UNION ALL SELECT 2020, 3, '2020Q3' UNION ALL SELECT 2020, 4, '2020Q4' ), yourTable AS ( SELECT 'I5434' AS patient_id, '2020-06-05'::date AS date, 'Methodist Hospital' AS org UNION ALL SELECT 'ertw4', '2020-08-03', 'New York Hospital' UNION ALL SELECT 'ouiku35', '2020-08-30', 'Tristar' UNION ALL SELECT 'ouiku35', '2020-01-05', 'Tristar' UNION ALL SELECT 'ouiku35', '2020-04-22', 'Tristar' ) SELECT q.label, COUNT(t.date) AS count FROM quarters q LEFT JOIN yourTable t ON EXTRACT(year FROM t.date) = q.year AND EXTRACT(quarter FROM t.date) = q.quarter GROUP BY q.label ORDER BY q.label;
label
count
2020Q1
1
2020Q2
2
2020Q3
2
2020Q4
0