CREATE TABLE table_train_76 ("id" NUMBER, "mini_mental_state_examination_mmse" NUMBER, "language" CLOB, "csf" NUMBER, "rosen_modified_hachinski_ischemic_score" NUMBER, "ad" BOOLEAN, "age" FLOAT, "NOUSE" FLOAT)

biomarker confirmed ad with csf level of abeta42 < 600 ng / ml
SELECT * FROM table_train_76 WHERE ad = 1 AND csf < 600
SELECT * FROM "table_train_76" WHERE "ad" = 1 AND "csf" < 600