mysql limit用法

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使用查询语句的时候，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。

SELECT * FROM table LIMIT [offset,] rows | rows OFFSET offset

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 。

mysql> SELECT * FROM table LIMIT 5,10; // 检索记录行 6-15

//如果只给定一个参数，它表示返回最大的记录行数目：
mysql> SELECT * FROM table LIMIT 5; //检索前 5 个记录行

//换句话说，LIMIT n 等价于 LIMIT 0,n。

注意： limit 不支持 -1，即 Limit 3, -1是非法的语句。

mysql> SELECT * FROM table LIMIT2 OFFSET 3

//检索从第三个开始的2条记录

实例：

case 1:

select myid from inventory order by inventory.myid ASC

//输出：
30
31
32
41
42
43
44

select myid from inventory order by inventory.myid ASC

LIMIT 2 OFFSET 3

//输出

等同于 LIMIT 3,2

case 2:

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; // 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)

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