CREATE TABLE table_test_12 ("id" NUMBER, "serum_potassium" FLOAT, "left_ventricular_ejection_fraction_lvef" NUMBER, "systolic_blood_pressure_sbp" NUMBER, "haemoglobin" FLOAT, "consent" BOOLEAN, "hemoglobin_a1c_hba1c" FLOAT, "heart_disease" BOOLEAN, "renal_disease" BOOLEAN, "anaemia" BOOLEAN, "creatinine_clearance_cl" FLOAT, "estimated_glomerular_filtration_rate_egfr" NUMBER, "symptomatic_hypotension" BOOLEAN, "kidney_disease" BOOLEAN, "NOUSE" FLOAT)

estimated gfr < 30 ml / min / 1.73 m2 as measured by the simplified mdrd formula or serum potassium > 5.2 mmol / l.
SELECT * FROM table_test_12 WHERE estimated_glomerular_filtration_rate_egfr < 30 OR serum_potassium > 5.2
SELECT * FROM "table_test_12" WHERE "estimated_glomerular_filtration_rate_egfr" < 30 OR "serum_potassium" > 5.2