Mysql学习PHP之Mysql常用SQL语句示例的深入分析

发布时间：2020-12-12 01:26:52 所属栏目：MySql教程来源：网络整理

导读：《Mysql学习PHP之Mysql常用SQL语句示例的深入分析》要点：本文介绍了Mysql学习PHP之Mysql常用SQL语句示例的深入分析，希望对您有用。如果有疑问，可以联系我们。 1.插入数据 insert into 表名(列名 1 , 列名 2 , 列名..) values (值 1 , 值 2 , 值...); ? 2

《Mysql学习PHP之Mysql常用SQL语句示例的深入分析》要点：
本文介绍了Mysql学习PHP之Mysql常用SQL语句示例的深入分析，希望对您有用。如果有疑问，可以联系我们。

1.插入数据
insert into表名(列名1,列名2,列名..) values(值1,值2,值...);?
2.更新数据
update 表名set列名1=值1,列名2=值2[where条件];? update product set name='LiNing', price=50where id=2;?
3.删除数据
deletefrom表名[where条件];? deletefrom product where id=2;
4.查询所有数据?
select*from表名;select*from product;
5.查询部份列
select列名1,列名N from表名; select name, price from product;
6.条件查询
# 比较 =,<,>,<=,>=,!= select*from表名where列名=值; select*from product where id=2; # and 与? select*from表名where条件1and条件2and条件N;? select*from product where name='Nike'and price=50; # or 或? select*from表名where条件1or条件2or条件N; select*from product where name='Nike'or price>50;? # not 非? select*from表名wherenot条件1; select*from product wherenot name='Nike';? #in 枚举? select*from表名where列名in(值1,值N);? select*from product where id in(2,3,4,10);? select*from product where id notin(2,10);? #like 模糊查询? select*from表名where列名 like '%值%';? select*from product where name like '%Li%';? #between...and... 范围查询? select*from表名where列名 between 值and值;? select*from order where created between '2010-01-01'and'2011-01-01';
7.查询排序
select*from表名 order by列名排序方式; #排序方式: asc(升序,默认),desc(降序)? select*from product order by created desc;
8.限制查询结果数量
select*from表名 limit 开始记录数,结果数量;select*from product limit 5; select*from product limit 2,5;
9.聚合函数
# count 总记录数? select count(列名)from student;? select count(id)from student;? # sum 总共? select sum(列名)from student;? select sum(age)from student;? # avg 平均值? select avg(列名)from student; select avg(age)as avg_age from student;? # max 最大值? select max(列名)from student;? select max(age)from student;? # min 最小值? select min(列名)from student;? select min(age)from student;
10.子查询
select name from student where age<(select avg(age)from student );? select*from product where id in(select id from order );
11.连接查询
select s.username as stu_name, t.name as te_name from student s, teacher t where s.teacher_id=t.id;

（编辑：李大同）

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