CREATE TABLE table_test_4 ("id" INT, "ejection_fraction_ef" INT, "systolic_blood_pressure_sbp" INT, "active_infection" BOOLEAN, "heart_disease" BOOLEAN, "renal_disease" BOOLEAN, "estimated_glomerular_filtration_rate_egfr" INT, "cardiogenic_shock" BOOLEAN, "diastolic_blood_pressure_dbp" INT, "symptomatic_hypotension" BOOLEAN, "severe_refractory_hypertension" BOOLEAN, "severe_left_ventricular_dysfunction" BOOLEAN, "NOUSE" FLOAT)

preexisting severe left ventricular dysfunction ( ef < 20 % )
SELECT * FROM table_test_4 WHERE severe_left_ventricular_dysfunction = 1 AND ejection_fraction_ef < 20
SELECT * FROM "table_test_4" WHERE "ejection_fraction_ef" < 20 AND "severe_left_ventricular_dysfunction" = 1