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,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2,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2,值N）; select*from product where id in（2,3,4,10）; select*from product where id notin（2,3,4,10）; #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;