sql语句判断身份证性别等

SELECT  t.card_number '身份证号',SUBSTR(t.card_number,1,2) AS "省份",
SUBSTR(t.card_number,7,4)    "出生年月",
SUBSTR(t.card_number,17,1)  "性别" ,
CASE (SUBSTR(t.card_number,17,1)%2)
WHEN 1 THEN '男'
WHEN  0 THEN '女'
END AS  '性别'  
FROM user t ;