Mysql 如何结合关系表连接两个表

如何从电话号码中获取customers.customer\u id的数据

我希望你们能帮我

customers
phonenumbers
customers_has_phonenumbers

customers -> detailed
customers.customer_id int(11) primary auto_increment
customers.customer_name varchar(255)

phonenumbers -> detailed
phonenumbers.phonenumber_id int(11) primary auto_increment
phonenumbers.phonenumber_type int(11)
phonenumbers.phonenumber_name varchar(255)
phonenumbers.phonenumber varchar(15)

customers_has_phonenumbers -> detailed
customers_has_phonenumbers.customer_id int(11) -> holds customers.customer_id
customers_has_phonenumbers.phonenumber_id int(11) -> holds phonenumbers.phonenumber_id

注意：将*替换为所需的字段，仅用于演示

一个更好的解决方案可能是删除中间的表，但当然，这只有在客户有一个电话号码时才有效

SELECT * FROM phonenumbers,customers,customers_has_phonenumbers
         WHERE customers.custumer_id = customers_has_phonenumers.customer_id
         AND phonenumbers.phonenumber_id = customers_has_phonenumers.phonenumber_id
         AND customers.customer_id = [ID HERE]