CREATE TABLE table_train_231 ("id" INT, "hemoglobin_a1c_hba1c" FLOAT, "heart_disease" BOOLEAN, "stroke" BOOLEAN, "renal_disease" BOOLEAN, "estimated_glomerular_filtration_rate_egfr" INT, "allergy_to_milk" BOOLEAN, "NOUSE" FLOAT)

hba1c >= 8 % within 3 months before surgery
SELECT * FROM table_train_231 WHERE hemoglobin_a1c_hba1c >= 8
SELECT * FROM "table_train_231" WHERE "hemoglobin_a1c_hba1c" >= 8