Question

有两个表ps_customer和ps_address。

ps_customer contains: id_customer and customer.email
ps_address contains: id_customer and few other fields.

我想选择ps_address表中不存在数据的客户。我正在使用Sql Query：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN SELECT id_customer FROM ps_address;

但它会引发查询SELECT id_customer FROM ps_address

出错的错误

Answer 1

你需要在这两张桌子上进行LEFT OUTER JOIN。

SELECT PSC.id_customer, PSCcustomer.email
FROM ps_customer PSC
LEFT OUTER JOIN ps_address PSA on PSC.id_customer = PSA.id_customer 
WHERE PSA.id_customer IS NULL

Answer 2

您需要在查询的最后部分放置括号，以表明它是子查询：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN ( SELECT id_customer FROM ps_address );

Answer 3

您可以使用左连接作为

select 
c.id_customer,
c.customer.email 
from ps_customer c
left join ps_address a on a.id_customer = c.id_customer
where a.id_customer is null

Answer 4

您可以尝试使用左连接

SELECT id_customer, customer.email FROM ps_customer pc left join ps_address pa
on pc.id_customer = pa.id_customer
where pa.id_customer is null;

Answer 5

您可以使用左连接：

SELECT id_customer, customer.email 
FROM ps_customer 
   left join ps_address on ps_customer.id_customer= ps_address.id_customer 
where ps_address.id_customer is null;

或者如果你想使用子查询，你必须在子查询周围使用()：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN ( SELECT id_customer FROM ps_address );

选择没有地址的客户

5 个答案: