Home Database Mysql Tutorial Mysql中limit的用法详解_MySQL

Mysql中limit的用法详解_MySQL

Jun 01, 2016 pm 02:01 PM

  Mysql中limit的用法:在我们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

  //为了检索从某一个偏移量到记录集的结束所有的记录行,可以指定第二个参数为 -1:

  mysql> SELECT * FROM table LIMIT 95,-1; // 检索记录行 96-last.

  //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 10和limit 9,1的不同:

  例如:

  1.


  Select * From cyclopedia Where ID>=(
  Select Max(ID) From (
  Select ID From cyclopedia Order By ID limit 90001
  ) As tmp
  ) limit 100;

  2.


  Select * From cyclopedia Where ID>=(
  Select Max(ID) From (
  Select ID From cyclopedia Order By ID limit 90000,1
  ) As tmp
  ) limit 100;

  
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