CREATE TABLE table_train_257 ("id" INT, "serum_bicarbonate" INT, "plasma_glucose_concentration" INT, "hemoglobin_a1c_hba1c" FLOAT, "platelets" INT, "visual_impairment" BOOLEAN, "NOUSE" FLOAT)

serum bicarbonate concentration < 15 mmol / l
SELECT * FROM table_train_257 WHERE serum_bicarbonate < 15
SELECT * FROM "table_train_257" WHERE "serum_bicarbonate" < 15