Mysql中通过身份证计算年龄

substring()函数用来截取出生年月日

year(now())- year(substring(borrower_idcard,7,8)) age, 用来计算年龄

SELECT
    *
FROM
    (
        SELECT
            DATE_FORMAT(substring(t.id_card, 7, 8),"%Y-%m-%d") birthday,
            YEAR (now()) - YEAR (substring(t.id_card, 7, 8)) age
        FROM
            teacher t
    ) temp