mysql enum使用

mysql> create table enum_test (e enum('a','b','c'));
Query OK, 0 rows affected (0.49 sec)

mysql> insert into enum_test (e) values('a'),('b'),('c');
Query OK, 3 rows affected (0.03 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> select * from enum_test;
+------+
| e    |
+------+
| a    |
| b    |
| c    |
+------+
3 rows in set (0.00 sec)

mysql> select e from enum_test;
+------+
| e    |
+------+
| a    |
| b    |
| c    |
+------+
3 rows in set (0.00 sec)

mysql> select e+1 from enum_test;
+------+
| e+1  |
+------+
|    2 |
|    3 |
|    4 |
+------+
3 rows in set (0.00 sec)

mysql>