mysql输出timestamp问题？？

timestamp输出的是2011-06-20 15:52:20
可以直接输出为2011-06-20 吗？？
怎么办？？

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mysql> create table tmp ( dt timestamp);
Query OK, 0 rows affected (0.04 sec)

mysql> insert into tmp values (null);
Query OK, 1 row affected (0.00 sec)

mysql> select DATE_FORMAT( dt, '%Y-%m-%d') A FROM tmp;
+------------+
| A |
+------------+
| 2011-10-18 |
+------------+
1 row in set (0.00 sec)

这个效果?

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字符串截取啊！

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