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ViewsRegistros únicos trimestre a trimestre
yo tengo una mesa asi -
patient_id date org I5434 2020-06-05 Methodist Hospital ertw4 2020-08-03 New York Hospital ouiku35 2020-08-30 Tristar ouiku35 2020-01-05 Tristar ouiku35 2020-04-22 TristarLa salida que necesito es
quarter count 2020Q1 1 2020Q2 1 2020Q3 1El tercer registro en la tabla anterior no se cuenta porque es el mismo paciente en trimestres anteriores en el mismo hospital
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Santiago Trujillo
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Podemos intentar usar un enfoque de tabla de calendario aquí:
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' ) 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; 
Manifestación
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Santiago Trujillo
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