建立表suppliers：
create table suppliers
s_id int not null auto_increment,
s_name char(50) not null,
s_city char(50) null,
s_zip char(10) null,
s_call char(50) not null,
primary key (s_id)
insert into suppliers(s_id, s_name,s_city, s_zip, s_call)
values(101,'fastfruit inc.','tianjin','300000','48075'),
(102,'lt supplies','chongqing','400000','44333'),
(103,'acme','shanghai','200000','90046'),
(104,'fnk inc.','zhongshan','528437','11111'),
(105,'good set','taiyuang','030000', '22222'),
(106,'just eat ours','beijing','010', '45678'),
(107,'dk inc.','zhengzhou','450000', '33332');
內連線select suppliers.s_id, s_name,f_name, f_price
from fruits ,suppliers
where fruits.s_id = suppliers.s_id;
使用 inner join 語法進行內連線查詢
select suppliers.s_id, s_name,f_name, f_price
from fruits
inner join suppliers on fruits.s_id = suppliers.s_id;
建立表orders：
create table orders
o_num int not null auto_increment,
o_date datetime not null,
c_id int not null,
primary key (o_num)
insert into orders(o_num, o_date, c_id)
values(30001, '2008-09-01', 10001),
(30002, '2008-09-12', 10003),
(30003, '2008-09-30', 10004),
(30004, '2008-10-03', 10005),
(30005, '2008-10-08', 10001);
左連線select customers.c_id, orders.o_num
from customers left outer join orders
on customers.c_id = orders.c_id;
右連線select customers.c_id, orders.o_num
from customers right outer join orders
on customers.c_id = orders.c_id;
復合條件連線查詢
select customers.c_id, orders.o_num
from customers inner join orders
on customers.c_id = orders.c_id and customers.c_id = 10001;
select suppliers.s_id, s_name,f_name, f_price
from fruits inner join suppliers
on fruits.s_id = suppliers.s_id
order by fruits.s_id;
【例.46】在fruits表和suppliers表之間使用內連線查詢，查詢之前，檢視兩個表的結構
select suppliers.s_id, s_name,f_name, f_price
from fruits ,suppliers
where fruits.s_id = suppliers.s_id;
【例.47】在fruits表和suppliers表之間使用inner join語法進行內連線查詢
select suppliers.s_id, s_name,f_name, f_price
from fruits inner join suppliers
on fruits.s_id = suppliers.s_id;
【例.48】查詢**f_id='a1'的水果**商提供的其他水果種類
select f1.f_id, f1.f_name
from fruits as f1, fruits as f2
where f1.s_id = f2.s_id and f2.f_id = 'a1';
【例.49】在customers表和orders表中，查詢所有客戶，包括沒有訂單的客戶，sql語法如下
select customers.c_id, orders.o_num
from customers left outer join orders
on customers.c_id = orders.c_id;
【例.50】在customers表和orders表中，查詢所有訂單，包括沒有客戶的訂單
select customers.c_id, orders.o_num
from customers right outer join orders
on customers.c_id = orders.c_id;
【例.51】在customers表和orders表中，使用inner join語法查詢customers表中id為10001、的客戶的訂單資訊
select customers.c_id, orders.o_num
from customers inner join orders
on customers.c_id = orders.c_id and customers.c_id = 10001;
【例.52】在fruits表和suppliers表之間使用inner join語法進行內連線查詢，並對查詢結果排序
select suppliers.s_id, s_name,f_name, f_price
from fruits inner join suppliers
on fruits.s_id = suppliers.s_id
order by fruits.s_id;
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