MYSQL ɾ³ýÖ÷¼ü³öÏÖ´íÎó£¡

 
mysql> select * from a;
+----+------+----------+
| id | name | password |
+----+------+----------+
| 1 | a | NULL |
| 2 | a | NULL |
| 3 | a | NULL |
| 4 | a | NULL |
+----+------+----------+
4 rows in set (0.00 sec)

mysql> alter table a drop primary key(id);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near '(id)'
 at line 1
mysql>


ʲôԭÒò°¡£¿£¿£¿£¿

---

µ±ÄúµÄÎÊÌâµÃµ½½â´ðºóÇ뼰ʱ½áÌù.
http://topic.csdn.net/u/20090501/15/7548d251-aec2-4975-a9bf-ca09a5551ba5.html