CREATE TABLE table_test_18 ("id" NUMBER, "bleeding" NUMBER, "dialysis" BOOLEAN, "hct" NUMBER, "hepatic_disease" BOOLEAN, "anaemia" BOOLEAN, "creatinine_clearance_cl" FLOAT, "polycytaemia" BOOLEAN, "thrombocytopenia" FLOAT, "kidney_disease" BOOLEAN, "body_mass_index_bmi" FLOAT, "glycosylated_hemoglobin" FLOAT, "NOUSE" FLOAT)

> 20 mg / dl creatinine or previous dialysis treatment.
SELECT * FROM table_test_18 WHERE creatinine_clearance_cl > 20 OR dialysis = 1
SELECT * FROM "table_test_18" WHERE "creatinine_clearance_cl" > 20 OR "dialysis" = 1