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Intro
zhaopuming edited this page Mar 26, 2012
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##. 问题描述:
我们设计一个简单的查询
从球员表中,查找“湖人”队中身高大于或等于198cm的队员。
这是一个简单的联表查询。假设数据库中有球员表和球队表,如下定义:
##. 数据库表单
球员表
create table player (
id int not null primary key auto_increment,
name varchar(200) not null,
number int not null,
height int not null default 198 comment 'cm',
teamId int not null,
foreign key (teamId) references team(id)
);
球队表
create table team (
id int not null primary key auto_increment,
name varchar(100) not null
);
##. SQL查询语句
select p.* from player as p, team as t
where p.teamId = t.id
and t.name like '%Lakers%'
and p.height >= 198;
##. 查询结果
+----+-------------------+--------+--------+--------+
| id | name | height | teamId | number |
+----+-------------------+--------+--------+--------+
| 1 | Kobe Bryant | 201 | 1 | 24 |
| 2 | Pau Gasol | 216 | 1 | 16 |
| 3 | Metta World Peace | 203 | 1 | 15 |
+----+-------------------+--------+--------+--------+