PHP之Mysql常用SQL语句示例的深入分析

1.插入数据 insert into 表名(列名 1 , 列名 2 , 列名..) values (值 1 , 值 2 , 值...); insert into product ( name , price , pic_path ) values ( 'Nike' , 500 , 'uploads/3245.jpg' ); 2.更新数据 update 表名 set 列名 1 =值

                        1.插入数据insert into表名(列名1,列名2,列名..) values(值1,值2,值...);  

insert into product(name, price, pic_path) values('Nike',500,'uploads/3245.jpg'); 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 selectfrom表名;selectfrom product; 5.查询部份列select列名1,列名2,列名N from表名; select name, price from product; 6.条件查询# 比较 =, <, >, <=, >=, != selectfrom表名where列名=值; selectfrom product where id=2;

1. and 与  selectfrom表名where条件1and条件2and条件N;  selectfrom product where name='Nike'and price=50;
2. or 或  selectfrom表名where条件1or条件2or条件N; selectfrom product where name='Nike'or price>50; 
3. not 非  selectfrom表名wherenot条件1; selectfrom product wherenot name='Nike';  #in 枚举  selectfrom表名where列名in(值1,值2,值N);  selectfrom product where id in(2,3,4,10);  selectfrom product where id notin(2,3,4,10);  #like 模糊查询  selectfrom表名where列名 like '%值%';  selectfrom product where name like '%Li%';  #between...and... 范围查询  selectfrom表名where列名 between 值and值;  selectfrom order where created between '2010-01-01'and'2011-01-01'; 7.查询排序selectfrom表名 order by列名排序方式; #排序方式: asc(升序，默认)，desc(降序)  selectfrom product order by created desc; 8.限制查询结果数量selectfrom表名 limit 开始记录数,结果数量;selectfrom product limit 5; selectfrom 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; 
4. sum 总共  select sum(列名)from student;  select sum(age)from student; 
5. avg 平均值  select avg(列名)from student; select avg(age)as avg_age from student; 
6. max 最大值  select max(列名)from student;  select max(age)from student; 
7. 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;