SELECT ab.* from WuZKCXX ab WHERE ab.shixrq IS NOT NULL AND fun_date_YorN(ab.shixrq) = 0 create or replace function fun_date_YorN(i_dt varchar2) return number is v_dt date;begin v_dt := to_date(i_dt, yyyy-mm-dd); return 1;exception when others then return 0;end fun_date_YorN;