我有这个文件：
1.nothing
2.o,s,f,d
3.f,d
4.o,s
5.s,f,d
6.s
7.nothing
8.s,f,d
9.o,d
10.s,f
还有一张桌子：
describe delete_me;
+------------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+----------------------+------+-----+---------+-------+
| id | int(11) | YES | | NULL | |
| privileges | set('o','s','f','d') | YES | | NULL | |
+------------+----------------------+------+-----+---------+-------+
当我尝试：
LOAD DATA INFILE 'privileges.txt' INTO TABLE delete_me FIELDS TERMINATED BY '.';
我明白了：
+------+------------+
| id | privileges |
+------+------------+
| 0 | |
| 2 | f,s,o |
| 3 | f |
| 4 | o |
| 5 | f,s |
| 6 | |
| 7 | |
| 8 | f,s |
| 9 | o |
| 10 | s |
| 11 | o |
| 12 | |
| 13 | o |
| 14 | o |
| 15 | s |
| 16 | |
| 17 | o |
| 18 | o |
| 19 | s,o |
| 20 | f |
+------+------------+
字母d刚刚消失。为什么呢？