CREATE TABLE table_test_12 ("id" NUMBER, "serum_potassium" FLOAT, "left_ventricular_ejection_fraction_lvef" NUMBER, "systolic_blood_pressure_sbp" NUMBER, "haemoglobin" FLOAT, "consent" BOOLEAN, "hemoglobin_a1c_hba1c" FLOAT, "heart_disease" BOOLEAN, "renal_disease" BOOLEAN, "anaemia" BOOLEAN, "creatinine_clearance_cl" FLOAT, "estimated_glomerular_filtration_rate_egfr" NUMBER, "symptomatic_hypotension" BOOLEAN, "kidney_disease" BOOLEAN, "NOUSE" FLOAT)

left ventricular ejection fraction > 30 %
SELECT * FROM table_test_12 WHERE left_ventricular_ejection_fraction_lvef > 30
SELECT * FROM "table_test_12" WHERE "left_ventricular_ejection_fraction_lvef" > 30