SQL语句在where语句错误中使用子查询

Question

我正在尝试更新位于美国＆＃39;的所有客户的电子邮件。通过引用Country表但我一直收到错误：错误代码：1054。未知列＆＃39; country＆＃39; in＆＃39; IN / ALL / ANY子查询＆＃39;

Update Customer
Set email = concat(substr(first_name,1,1), last_name,'@sakilacustomer.com.us')
where country in(Select country From customer
join address using(address_id)
join city using(city_id)
join country using(country_id)
Group by country
Having country = 'United States');

还试过......

Update Customer
Set email = concat(substr(first_name,1,1), last_name, '@sakilacustomer.com.us')
where country in(Select country From country where country = 'United States');

我正在提供可用作参考的EER图的图像

Answer 1

这看起来很复杂。怎么样？

Update Customer c join
       address a
       using (address_id) join
       city ci
       using (city_id) join
       country co
       using (country_id)
    set c.email = concat(left(c.first_name, 1), clast_name, '@sakilacustomer.com.us')
where co.country = 'United States';

不知何故，我认为您的查询问题是customer没有country，因此错误是country in而不是子查询内部。但错误信息本身相当令人困惑。

Answer 2

尝试这样的事情：

 Update a
 set a.email = concat(substr(first_name,1,1), last_name,'@sakilacustomer.com.us')
 from customer a join 
(select * from  customer a
join address b on a.address_id=b.address_id
join city c on a.city_id=c.city_id
join country d on a.country_id=d.country_id 
where country='united states'
 ) b 
 on a.customer_id=b.customer_id

Answer 3

update Customer
set email = concat(substr(first_name,1,1), last_name, '@sakilacustomer.com.us')
where customer_id in (
    select customer_id
    from customer join address using(address_id)
         join city using(city_id)
         join country using(country_id)
    where country = 'United States'
);