×××相關的SQL

--根據×××查詢年齡
SELECT u.tname, u.sexflag, id_num
, CASE
WHEN LENGTH(id_num) = 18 THEN YEAR(NOW()) - CAST(SUBSTRING(id_num, 7, 4) AS SIGNED)
ELSE ''
END AS age, u.org_name
FROM TB_GH_USER U;;

 --補充性別字段，1是男，2是女

UPDATE tb_gh_user
SET sexflag = CASE
WHEN CAST(SUBSTRING(id_num, 17, 1) AS SIGNED) % 2 = 1 THEN '1'
ELSE '2'
END
WHERE LENGTH(id_num) > 2 ;