用查询语句的时候，经常要返回前几条或者中间某几行数据，这个时候怎么办呢？不用担心，mysql已 经为我们提供了这样一个功能。
LIMIT 子句可以被用于强制 SELECT 语句返回指定的记录数。LIMIT 接受一个或两个数字参数。参数必须是一个整数常量。如果给定两个参数，第一个参数指定第一个返回记录行的偏移量，第二个参数指定返回记录行的最大数目。初 始记录行的偏移量是 0(而不是 1)： 为了与 PostgreSQL 兼容，MySQL 也支持句法： LIMIT # OFFSET #。
实例：
mysql> use sppeivan;
Database changed
mysql> select * from employee; // 返回所有结果
+------------+------------+--------+-------------+
| username | password | gender | cellphone |
+------------+------------+--------+-------------+
| ewrew | erewr | MAN | 13618889076 |
| ewrwerw32r | 324324 | MAN | 13618889076 |
| grrrrr | r44343 | WOMAN | 13618889076 |
| pansong | erewrwe | MAN | 13618889076 |
| ret43t43t | 43t43 | MAN | 13618889076 |
| ret44t4 | r4tgr | WOMAN | 13618889076 |
| tttt | 4et | WOMAN | 13618889076 |
| wr34r | retre | MAN | 13618889076 |
| xxx | safe | MAN | 13618889076 |
| hhh | ewrwer | MAN | 13618889076 |
| hg | 6574326543 | MAN | 13618889076 |
| ps | ewrwe | MAN | 13618889076 |
| zhu | werew | MAN | 13618889076 |
+------------+------------+--------+-------------+
13 rows in set (0.01 sec)
mysql> select * from employee limit 3 7;
ERROR 1064 (42000): You have an error in your SQL syntax
corresponds to your MySQL server version for the right s
line 1
mysql> select * from employee limit 3, 7; // 返回4-11行
+-----------+----------+--------+-------------+
| username | password | gender | cellphone |
+-----------+----------+--------+-------------+
| pansong | erewrwe | MAN | 13618889076 |
| ret43t43t | 43t43 | MAN | 13618889076 |
| ret44t4 | r4tgr | WOMAN | 13618889076 |
| tttt | 4et | WOMAN | 13618889076 |
| wr34r | retre | MAN | 13618889076 |
| xxx | safe | MAN | 13618889076 |
| hhh | ewrwer | MAN | 13618889076 |
+-----------+----------+--------+-------------+
7 rows in set (0.00 sec)
mysql> select * from employee limit 3,-1; // 错误语法
ERROR 1064 (42000): You have an error in your SQL syntax
corresponds to your MySQL server version for the right s
t line 1
mysql> select * from employee limit 3,1; // 返回第4行
+----------+----------+--------+-------------+
| username | password | gender | cellphone |
+----------+----------+--------+-------------+
| pansong | erewrwe | MAN | 13618889076|
+----------+----------+--------+-------------+
1 row in set (0.00 sec)
mysql> select * from employee limit 3; // 返回前3行
+------------+----------+--------+-------------+
| username | password | gender | cellphone |
+------------+----------+--------+-------------+
| ewrew | erewr | MAN | 13618889076 |
| ewrwerw32r | 324324 | MAN | 13618889076 |
| grrrrr | r44343 | WOMAN | 13618889076 |
+------------+----------+--------+-------------+
3 rows in set (0.00 sec)
mysql> select * from employee limit 10; // 返回前10行
+------------+----------+--------+-------------+
| username | password | gender | cellphone |
+------------+----------+--------+-------------+
| ewrew | erewr | MAN | 13618889076 |
| ewrwerw32r | 324324 | MAN | 13618889076 |
| grrrrr | r44343 | WOMAN | 13618889076 |
| pansong | erewrwe | MAN | 13618889076 |
| ret43t43t | 43t43 | MAN | 13618889076 |
| ret44t4 | r4tgr | WOMAN | 13618889076 |
| tttt | 4et | WOMAN | 13618889076 |
| wr34r | retre | MAN | 13618889076 |
| xxx | safe | MAN | 13811588469 |
| hhh | ewrwer | MAN | 13618889076 |
+------------+----------+--------+-------------+
10 rows in set (0.00 sec)
mysql> select * from employee limit 9,1; // 返回第10行
+----------+----------+--------+-------------+
| username | password | gender | cellphone |
+----------+----------+--------+-------------+
| hhh | ewrwer | MAN | 13816668468 |
+----------+----------+--------+-------------+
1 row in set (0.00 sec)
