Mysql 简单查询语句汇总

Posted 2021-09-14 JenK

把一些mysql的常用语法进行下汇总

1.简单语句

/*websites  表名   NAME alexa url country  字段*/
SELECT * FROM websites;                      /* 查询表所有数据 */

SELECT NAME FROM websites;                   /* 查询表字段数据 */

SELECT * FROM websites where name = "广西";   /* 查询表字段下条件数据 */

SELECT * from websites where name like "_o%"; /* 模糊查询表下数据 */

SELECT * FROM websites where id BETWEEN "1" AND "5";    /* 查询表下字段范围数据 */

SELECT * FROM websites WHERE name in ("广西","百度");    /* 查询表字段下固定条件数据 */

SELECT DISTINCT country FROM Websites;                  /* 查询去重值 */

SELECT * FROM Websites WHERE country = "CN" AND alexa > 50;  /*查询表下范围条件数据*/

SELECT * FROM Websites WHERE country = "USA" OR country="sh"; /* 查询表下条件不同值 */

SELECT * FROM Websites ORDER BY alexa;                      /* 查询表下值排序结果 */

SELECT * FROM Websites ORDER BY alexa DESC;                 /* 查询表下排序结果降序 */

SELECT * FROM Websites LIMIT 2;      /* 查询表下范围数据 */

SELECT name as zzz from websites;    /*别名查询表下数据*/

2.分页

select _column,_column from _table [where Clause] [limit N][offset M]

select * : 返回所有记录
limit N : 返回 N 条记录
offset M : 跳过 M 条记录, 默认 M=0, 单独使用似乎不起作用
limit N,M : 相当于 limit M offset N , 从第 N 条记录开始, 返回 M 条记录
实现分页：

select * from _table limit (page_number-1)*lines_perpage, lines_perpage

或

select * from _table limit lines_perpage offset (page_number-1)*lines_perpage