CREATE TABLE table_train_239 ("id" NUMBER, "basal_c_peptide" FLOAT, "body_weight" FLOAT, "renal_disease" BOOLEAN, "creatinine_clearance_cl" FLOAT, "serum_creatinine" FLOAT, "stimulated" BOOLEAN, "body_mass_index_bmi" FLOAT, "NOUSE" FLOAT)

patients with corrected creatinine clearance of less than 40 .
SELECT * FROM table_train_239 WHERE creatinine_clearance_cl < 40
SELECT * FROM "table_train_239" WHERE "creatinine_clearance_cl" < 40