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SQL中查询前几条或者中间某几行数据limit

三三 2022-03-26 1868 0条评论 Linux使用

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

使用查询语句的时候,要返回前几条或者中间某几行数据,用Llimit 可以实现:

1. 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 #。

2.//检索记录行6-15

mysql> SELECT * FROM table LIMIT 5,10; 

3. //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:
// 检索记录行 96-last.

mysql> SELECT * FROM table LIMIT 95,-1; 

4. //如果只给定一个参数,它表示返回最大的记录行数目:
//检索前 5 个记录行

mysql> SELECT * FROM table LIMIT 5;  

//换句话说,LIMIT n 等价于 LIMIT 0,n。

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