--从身份证获取年龄   
select 
to_char(to_date(sysdate,'yyyy'))-substr(cust_id,10,4)
 from system.dual;
    
    
 --从身份证获取性别
SELECT  
CASE (substr(cust_id,17,1)%2)
WHEN 1 THEN '1'
WHEN  0 THEN '2'
END AS  'sex'  
FROM  t.a ;