CREATE TABLE table_test_23 ("id" NUMBER, "previous_mi" BOOLEAN, "anemia" BOOLEAN, "left_ventricular_ejection_fraction_lvef" NUMBER, "tolerate_gadolinium_contrast_media" BOOLEAN, "renal_disease" BOOLEAN, "creatinine_clearance_cl" FLOAT, "estimated_glomerular_filtration_rate_egfr" NUMBER, "tolerate_magnetic_resonance_imaging" BOOLEAN, "chronic_inflammatory_disease" BOOLEAN, "platelet_count" FLOAT, "thrombocytopenia" FLOAT, "liver_disease" BOOLEAN, "evidence_of_hepatobiliary_disease" BOOLEAN, "kidney_disease" BOOLEAN, "hb" FLOAT, "body_mass_index_bmi" FLOAT, "age" FLOAT, "NOUSE" FLOAT)

age below 18 years;
SELECT * FROM table_test_23 WHERE age < 18
SELECT * FROM "table_test_23" WHERE "age" < 18