日期查询：

mysql> select * from member where birthday > '1962-01-01';

mysql> select * from member order by lastname desc,birthday asc;
+----+----------+-----------+--------+------------+-------+-----+
| id | lastname | firstname | status | birthday   | score | sex |
+----+----------+-----------+--------+------------+-------+-----+
|  6 | z        | y         |        | 0000-00-00 |    60 | 0   |
|  1 | james    | john      | s      | 1972-01-01 |    60 | 1   |
|  5 | hash     | newer     | n      | 1922-05-01 |    60 | 1   |
|  3 | hacker   | johner    | s      | 1952-11-01 |   100 | 0   |
|  4 | busher   | packer    | s      | 1962-01-01 |     0 | 1   |
|  2 | bush     | pack      | s      | 1979-01-01 |    60 | 1   |
+----+----------+-----------+--------+------------+-------+-----+
6 rows in set (0.00 sec)

mysql> select * from member order by birthday asc limit 3;
+----+----------+-----------+--------+------------+-------+-----+
| id | lastname | firstname | status | birthday   | score | sex |
+----+----------+-----------+--------+------------+-------+-----+
|  6 | z        | y         |        | 0000-00-00 |    60 | 0   |
|  5 | hash     | newer     | n      | 1922-05-01 |    60 | 1   |
|  3 | hacker   | johner    | s      | 1952-11-01 |   100 | 0   |
+----+----------+-----------+--------+------------+-------+-----+
3 rows in set (0.01 sec)

mysql> select * from member order by birthday asc limit 2,3;
+----+----------+-----------+--------+------------+-------+-----+
| id | lastname | firstname | status | birthday   | score | sex |
+----+----------+-----------+--------+------------+-------+-----+
|  3 | hacker   | johner    | s      | 1952-11-01 |   100 | 0   |
|  4 | busher   | packer    | s      | 1962-01-01 |     0 | 1   |
|  1 | james    | john      | s      | 1972-01-01 |    60 | 1   |
+----+----------+-----------+--------+------------+-------+-----+
3 rows in set (0.01 sec)

随机输出限定数量（两个）结果：抽取幸运观众什么的

mysql> select * from member order by rand() limit 2;
mysql> select 17,format(sqrt(3*3+4*4),0);
+----+-------------------------+
| 17 | format(sqrt(3*3+4*4),0) |
+----+-------------------------+
| 17 | 5                       |
+----+-------------------------+
1 row in set (0.00 sec)
合并输出：
mysql> select concat(firstname,' ',lastname) from member order by rand() asc limit 2;
+--------------------------------+
| concat(firstname,' ',lastname) |
+--------------------------------+
| pack bush                      |
| y z                            |
+--------------------------------+
2 rows in set (0.00 sec)