mysql之set与enum的介绍

mysql> create table db_set(
    -> set1 set('x','y','z') not null,
    -> enum1 enum('one','two','three') not null);
Query OK, 0 rows affected (0.06 sec)
mysql> desc db_set;
+-------+---------------------------+------+-----+---------+-------+
| Field | Type                      | Null | Key | Default | Extra |
+-------+---------------------------+------+-----+---------+-------+
| set1  | set('x','y','z')          | NO   |     | NULL    |       |
| enum1 | enum('one','two','three') | NO   |     | NULL    |       |
+-------+---------------------------+------+-----+---------+-------+
mysql> insert into db_set values(1,3),(1,4),(4,1);
Query OK, 3 rows affected, 1 warning (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 1
mysql> select from db_set ;
+------+-------+
| set1 | enum1 |
+------+-------+
| x    | three |
| x    |       |
| z    | one   |
+------+-------+
3 rows in set (0.01 sec)