mysql left join 如何使用

有三张表:products、orders、order_product

create table products(
product_code varchar(20) primary key not null,
product_name varchar(20),
product_price float
);

create table orders(
order_id varchar(40) primary key not null,
order_status enum('0','1','2') default '0',
);

create table order_product(
order_id varchar(40) primary key not null,
product_code varchar(20)
foreign key(order_id) references orders(order_id),
foreign key(product_code) references products(product_code)
);

问题1:查询 order_product 表(只要有一条记录就行),要求 order_product.product_code='1111111' 并且 order_product.order_id 在 orders 表里已存在,并且 orders.order_status='0'?

我的写法:SELECT * FROM orders_product AS op LEFT JOIN orders AS od ON op.product_id=od.product_id WHERE op.product_code='1111'AND od.order_status='0' LIMIT 1;

结果报 1045 错误,请高手指点,非常感谢!

 SELECT * FROM order_product AS op LEFT JOIN orders AS od 
ON 
op.order_id=od.order_id WHERE op.product_code='111111'AND od.order_status='2' LIMIT 1;

这样写就可以了,对于order_product表中压根没有product_id字段,你怎么进行关联啊!换成order_id进行挂链。
图片说明

换成INNER JOIN..ON 试试

limit 1?,,应该是limit a,b,,,从第a条到第b条数据吧,,,

1045是登陆问题诶

SELECT * FROM order_product AS op LEFT JOIN orders AS od ON op.order_id = od.order_id WHERE op.order_id='1111'AND od.order_status='0' LIMIT 1;

你自己写的命名都乱套了....