列舉型別與集合型別

欄位的值只能在給定範圍中選擇，如單選框，多選框

enum 單選 只能在給定的範圍內選一個值，如性別 sex 男male/女female

set 多選 在給定的範圍內可以選擇一個或一個以上的值（愛好1,愛好2,愛好3...）

MariaDB [db1]> create table consumer( 
    -> name varchar(50),
    -> sex enum('male','female'),
    -> level enum('vip1','vip2','vip3','vip4','vip5'), #在指定範圍內，多選一
    -> hobby set('play','music','read','study') #在指定範圍內，多選多
    -> );

MariaDB [db1]> insert into consumer values  
    -> ('egon','male','vip5','read,study'),
    -> ('alex','female','vip1','girl');

MariaDB [db1]> select * from consumer;
+------+--------+-------+------------+
| name | sex    | level | hobby      |
+------+--------+-------+------------+
| egon | male   | vip5  | read,study |
| alex | female | vip1  |            |
+------+--------+-------+------------+